// This code was written by Tyler Akins and has been placed in the
// public domain.  It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com

var Base64 = (function () {
    var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    var obj = {
        /**
         * Encodes a string in base64
         * @param {String} input The string to encode in base64.
         */
        encode: function (input) {
            var output = "";
            var chr1, chr2, chr3;
            var enc1, enc2, enc3, enc4;
            var i = 0;

            do {
                chr1 = input.charCodeAt(i++);
                chr2 = input.charCodeAt(i++);
                chr3 = input.charCodeAt(i++);

                enc1 = chr1 >> 2;
                enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
                enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
                enc4 = chr3 & 63;

                if (isNaN(chr2)) {
                    enc3 = enc4 = 64;
                } else if (isNaN(chr3)) {
                    enc4 = 64;
                }

                output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) +
                    keyStr.charAt(enc3) + keyStr.charAt(enc4);
            } while (i < input.length);

            return output;
        },

        /**
         * Decodes a base64 string.
         * @param {String} input The string to decode.
         */
        decode: function (input) {
            var output = "";
            var chr1, chr2, chr3;
            var enc1, enc2, enc3, enc4;
            var i = 0;

            // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
            input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

            do {
                enc1 = keyStr.indexOf(input.charAt(i++));
                enc2 = keyStr.indexOf(input.charAt(i++));
                enc3 = keyStr.indexOf(input.charAt(i++));
                enc4 = keyStr.indexOf(input.charAt(i++));

                chr1 = (enc1 << 2) | (enc2 >> 4);
                chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
                chr3 = ((enc3 & 3) << 6) | enc4;

                output = output + String.fromCharCode(chr1);

                if (enc3 != 64) {
                    output = output + String.fromCharCode(chr2);
                }
                if (enc4 != 64) {
                    output = output + String.fromCharCode(chr3);
                }
            } while (i < input.length);

            return output;
        }
    };

    return obj;
})();
/*
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
 * in FIPS PUB 180-1
 * Version 2.1a Copyright Paul Johnston 2000 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for details.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0;
/* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad = "=";
/* base-64 pad character. "=" for strict RFC compliance   */
var chrsz = 8;
/* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_sha1(s) {
    return binb2hex(core_sha1(str2binb(s), s.length * chrsz));
}
function b64_sha1(s) {
    return binb2b64(core_sha1(str2binb(s), s.length * chrsz));
}
function str_sha1(s) {
    return binb2str(core_sha1(str2binb(s), s.length * chrsz));
}
function hex_hmac_sha1(key, data) {
    return binb2hex(core_hmac_sha1(key, data));
}
function b64_hmac_sha1(key, data) {
    return binb2b64(core_hmac_sha1(key, data));
}
function str_hmac_sha1(key, data) {
    return binb2str(core_hmac_sha1(key, data));
}

/*
 * Perform a simple self-test to see if the VM is working
 */
function sha1_vm_test() {
    return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
}

/*
 * Calculate the SHA-1 of an array of big-endian words, and a bit length
 */
function core_sha1(x, len) {
    /* append padding */
    x[len >> 5] |= 0x80 << (24 - len % 32);
    x[((len + 64 >> 9) << 4) + 15] = len;

    var w = new Array(80);
    var a = 1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d = 271733878;
    var e = -1009589776;

    var i, j, t, olda, oldb, oldc, oldd, olde;
    for (i = 0; i < x.length; i += 16) {
        olda = a;
        oldb = b;
        oldc = c;
        oldd = d;
        olde = e;

        for (j = 0; j < 80; j++) {
            if (j < 16) {
                w[j] = x[i + j];
            }
            else {
                w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
            }
            t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
                safe_add(safe_add(e, w[j]), sha1_kt(j)));
            e = d;
            d = c;
            c = rol(b, 30);
            b = a;
            a = t;
        }

        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd);
        e = safe_add(e, olde);
    }
    return [a, b, c, d, e];
}

/*
 * Perform the appropriate triplet combination function for the current
 * iteration
 */
function sha1_ft(t, b, c, d) {
    if (t < 20) {
        return (b & c) | ((~b) & d);
    }
    if (t < 40) {
        return b ^ c ^ d;
    }
    if (t < 60) {
        return (b & c) | (b & d) | (c & d);
    }
    return b ^ c ^ d;
}

/*
 * Determine the appropriate additive constant for the current iteration
 */
function sha1_kt(t) {
    return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
        (t < 60) ? -1894007588 : -899497514;
}

/*
 * Calculate the HMAC-SHA1 of a key and some data
 */
function core_hmac_sha1(key, data) {
    var bkey = str2binb(key);
    if (bkey.length > 16) {
        bkey = core_sha1(bkey, key.length * chrsz);
    }

    var ipad = new Array(16), opad = new Array(16);
    for (var i = 0; i < 16; i++) {
        ipad[i] = bkey[i] ^ 0x36363636;
        opad[i] = bkey[i] ^ 0x5C5C5C5C;
    }

    var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
    return core_sha1(opad.concat(hash), 512 + 160);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y) {
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function rol(num, cnt) {
    return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert an 8-bit or 16-bit string to an array of big-endian words
 * In 8-bit function, characters >255 have their hi-byte silently ignored.
 */
function str2binb(str) {
    var bin = [];
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < str.length * chrsz; i += chrsz) {
        bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (32 - chrsz - i % 32);
    }
    return bin;
}

/*
 * Convert an array of big-endian words to a string
 */
function binb2str(bin) {
    var str = "";
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < bin.length * 32; i += chrsz) {
        str += String.fromCharCode((bin[i >> 5] >>> (32 - chrsz - i % 32)) & mask);
    }
    return str;
}

/*
 * Convert an array of big-endian words to a hex string.
 */
function binb2hex(binarray) {
    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var str = "";
    for (var i = 0; i < binarray.length * 4; i++) {
        str += hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xF) +
            hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8  )) & 0xF);
    }
    return str;
}

/*
 * Convert an array of big-endian words to a base-64 string
 */
function binb2b64(binarray) {
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var str = "";
    var triplet, j;
    for (var i = 0; i < binarray.length * 4; i += 3) {
        triplet = (((binarray[i >> 2] >> 8 * (3 - i % 4)) & 0xFF) << 16) |
            (((binarray[i + 1 >> 2] >> 8 * (3 - (i + 1) % 4)) & 0xFF) << 8 ) |
            ((binarray[i + 2 >> 2] >> 8 * (3 - (i + 2) % 4)) & 0xFF);
        for (j = 0; j < 4; j++) {
            if (i * 8 + j * 6 > binarray.length * 32) {
                str += b64pad;
            }
            else {
                str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);
            }
        }
    }
    return str;
}
/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

var MD5 = (function () {
    /*
     * Configurable variables. You may need to tweak these to be compatible with
     * the server-side, but the defaults work in most cases.
     */
    var hexcase = 0;
    /* hex output format. 0 - lowercase; 1 - uppercase */
    var b64pad = "";
    /* base-64 pad character. "=" for strict RFC compliance */
    var chrsz = 8;
    /* bits per input character. 8 - ASCII; 16 - Unicode */

    /*
     * Add integers, wrapping at 2^32. This uses 16-bit operations internally
     * to work around bugs in some JS interpreters.
     */
    var safe_add = function (x, y) {
        var lsw = (x & 0xFFFF) + (y & 0xFFFF);
        var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
        return (msw << 16) | (lsw & 0xFFFF);
    };

    /*
     * Bitwise rotate a 32-bit number to the left.
     */
    var bit_rol = function (num, cnt) {
        return (num << cnt) | (num >>> (32 - cnt));
    };

    /*
     * Convert a string to an array of little-endian words
     * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
     */
    var str2binl = function (str) {
        var bin = [];
        var mask = (1 << chrsz) - 1;
        for (var i = 0; i < str.length * chrsz; i += chrsz) {
            bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);
        }
        return bin;
    };

    /*
     * Convert an array of little-endian words to a string
     */
    var binl2str = function (bin) {
        var str = "";
        var mask = (1 << chrsz) - 1;
        for (var i = 0; i < bin.length * 32; i += chrsz) {
            str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);
        }
        return str;
    };

    /*
     * Convert an array of little-endian words to a hex string.
     */
    var binl2hex = function (binarray) {
        var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
        var str = "";
        for (var i = 0; i < binarray.length * 4; i++) {
            str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +
                hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8  )) & 0xF);
        }
        return str;
    };

    /*
     * Convert an array of little-endian words to a base-64 string
     */
    var binl2b64 = function (binarray) {
        var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        var str = "";
        var triplet, j;
        for (var i = 0; i < binarray.length * 4; i += 3) {
            triplet = (((binarray[i >> 2] >> 8 * ( i % 4)) & 0xFF) << 16) |
                (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8 ) |
                ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);
            for (j = 0; j < 4; j++) {
                if (i * 8 + j * 6 > binarray.length * 32) {
                    str += b64pad;
                }
                else {
                    str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);
                }
            }
        }
        return str;
    };

    /*
     * These functions implement the four basic operations the algorithm uses.
     */
    var md5_cmn = function (q, a, b, x, s, t) {
        return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
    };

    var md5_ff = function (a, b, c, d, x, s, t) {
        return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
    };

    var md5_gg = function (a, b, c, d, x, s, t) {
        return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
    };

    var md5_hh = function (a, b, c, d, x, s, t) {
        return md5_cmn(b ^ c ^ d, a, b, x, s, t);
    };

    var md5_ii = function (a, b, c, d, x, s, t) {
        return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
    };

    /*
     * Calculate the MD5 of an array of little-endian words, and a bit length
     */
    var core_md5 = function (x, len) {
        /* append padding */
        x[len >> 5] |= 0x80 << ((len) % 32);
        x[(((len + 64) >>> 9) << 4) + 14] = len;

        var a = 1732584193;
        var b = -271733879;
        var c = -1732584194;
        var d = 271733878;

        var olda, oldb, oldc, oldd;
        for (var i = 0; i < x.length; i += 16) {
            olda = a;
            oldb = b;
            oldc = c;
            oldd = d;

            a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
            d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
            c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
            b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
            a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
            d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
            c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
            b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
            a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
            d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
            c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
            b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
            a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
            d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
            c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
            b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);

            a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
            d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
            c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
            b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
            a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
            d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
            c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
            b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
            a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
            d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
            c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
            b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
            a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
            d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
            c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
            b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);

            a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
            d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
            c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
            b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
            a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
            d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
            c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
            b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
            a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
            d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
            c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
            b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
            a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
            d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
            c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
            b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);

            a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
            d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
            c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
            b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
            a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
            d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
            c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
            b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
            a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
            d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
            c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
            b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
            a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
            d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
            c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
            b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);

            a = safe_add(a, olda);
            b = safe_add(b, oldb);
            c = safe_add(c, oldc);
            d = safe_add(d, oldd);
        }
        return [a, b, c, d];
    };


    /*
     * Calculate the HMAC-MD5, of a key and some data
     */
    var core_hmac_md5 = function (key, data) {
        var bkey = str2binl(key);
        if (bkey.length > 16) {
            bkey = core_md5(bkey, key.length * chrsz);
        }

        var ipad = new Array(16), opad = new Array(16);
        for (var i = 0; i < 16; i++) {
            ipad[i] = bkey[i] ^ 0x36363636;
            opad[i] = bkey[i] ^ 0x5C5C5C5C;
        }

        var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
        return core_md5(opad.concat(hash), 512 + 128);
    };

    var obj = {
        /*
         * These are the functions you'll usually want to call.
         * They take string arguments and return either hex or base-64 encoded
         * strings.
         */
        hexdigest: function (s) {
            return binl2hex(core_md5(str2binl(s), s.length * chrsz));
        },

        b64digest: function (s) {
            return binl2b64(core_md5(str2binl(s), s.length * chrsz));
        },

        hash: function (s) {
            return binl2str(core_md5(str2binl(s), s.length * chrsz));
        },

        hmac_hexdigest: function (key, data) {
            return binl2hex(core_hmac_md5(key, data));
        },

        hmac_b64digest: function (key, data) {
            return binl2b64(core_hmac_md5(key, data));
        },

        hmac_hash: function (key, data) {
            return binl2str(core_hmac_md5(key, data));
        },

        /*
         * Perform a simple self-test to see if the VM is working
         */
        test: function () {
            return MD5.hexdigest("abc") === "900150983cd24fb0d6963f7d28e17f72";
        }
    };

    return obj;
})();
/*
 This program is distributed under the terms of the MIT license.
 Please see the LICENSE file for details.

 Copyright 2006-2008, OGG, LLC
 */

/*global document, window, setTimeout, clearTimeout, console,
 XMLHttpRequest, ActiveXObject,
 Base64, MD5,
 Strophe, $build, $msg, $iq, $pres */

/** File: strophe.js
 *  A JavaScript library for XMPP BOSH/XMPP over Websocket.
 *
 *  This is the JavaScript version of the Strophe library.  Since JavaScript
 *  had no facilities for persistent TCP connections, this library uses
 *  Bidirectional-streams Over Synchronous HTTP (BOSH) to emulate
 *  a persistent, stateful, two-way connection to an XMPP server.  More
 *  information on BOSH can be found in XEP 124.
 *
 *  This version of Strophe also works with WebSockets.
 *  For more information on XMPP-over WebSocket see this RFC draft:
 *  http://tools.ietf.org/html/draft-ietf-xmpp-websocket-00
 */

/** PrivateFunction: Function.prototype.bind
 *  Bind a function to an instance.
 *
 *  This Function object extension method creates a bound method similar
 *  to those in Python.  This means that the 'this' object will point
 *  to the instance you want.  See
 *  <a href='https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind'>MDC's bind() documentation</a> and
 *  <a href='http://benjamin.smedbergs.us/blog/2007-01-03/bound-functions-and-function-imports-in-javascript/'>Bound Functions and Function Imports in JavaScript</a>
 *  for a complete explanation.
 *
 *  This extension already exists in some browsers (namely, Firefox 3), but
 *  we provide it to support those that don't.
 *
 *  Parameters:
 *    (Object) obj - The object that will become 'this' in the bound function.
 *    (Object) argN - An option argument that will be prepended to the
 *      arguments given for the function call
 *
 *  Returns:
 *    The bound function.
 */
if (!Function.prototype.bind) {
    Function.prototype.bind = function (obj /*, arg1, arg2, ... */) {
        var func = this;
        var _slice = Array.prototype.slice;
        var _concat = Array.prototype.concat;
        var _args = _slice.call(arguments, 1);

        return function () {
            return func.apply(obj ? obj : this,
                _concat.call(_args,
                    _slice.call(arguments, 0)));
        };
    };
}

/** PrivateFunction: Array.prototype.indexOf
 *  Return the index of an object in an array.
 *
 *  This function is not supplied by some JavaScript implementations, so
 *  we provide it if it is missing.  This code is from:
 *  http://developer.mozilla.org/En/Core_JavaScript_1.5_Reference:Objects:Array:indexOf
 *
 *  Parameters:
 *    (Object) elt - The object to look for.
 *    (Integer) from - The index from which to start looking. (optional).
 *
 *  Returns:
 *    The index of elt in the array or -1 if not found.
 */
if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function (elt /*, from*/) {
        var len = this.length;

        var from = Number(arguments[1]) || 0;
        from = (from < 0) ? Math.ceil(from) : Math.floor(from);
        if (from < 0) {
            from += len;
        }

        for (; from < len; from++) {
            if (from in this && this[from] === elt) {
                return from;
            }
        }

        return -1;
    };
}

/* All of the Strophe globals are defined in this special function below so
 * that references to the globals become closures.  This will ensure that
 * on page reload, these references will still be available to callbacks
 * that are still executing.
 */

(function (callback) {
    var Strophe;

    /** Function: $build
     *  Create a Strophe.Builder.
     *  This is an alias for 'new Strophe.Builder(name, attrs)'.
     *
     *  Parameters:
     *    (String) name - The root element name.
     *    (Object) attrs - The attributes for the root element in object notation.
     *
     *  Returns:
     *    A new Strophe.Builder object.
     */
    function $build(name, attrs) {
        return new Strophe.Builder(name, attrs);
    }

    /** Function: $msg
     *  Create a Strophe.Builder with a <message/> element as the root.
     *
     *  Parmaeters:
     *    (Object) attrs - The <message/> element attributes in object notation.
     *
     *  Returns:
     *    A new Strophe.Builder object.
     */
    function $msg(attrs) {
        return new Strophe.Builder("message", attrs);
    }

    /** Function: $iq
     *  Create a Strophe.Builder with an <iq/> element as the root.
     *
     *  Parameters:
     *    (Object) attrs - The <iq/> element attributes in object notation.
     *
     *  Returns:
     *    A new Strophe.Builder object.
     */
    function $iq(attrs) {
        return new Strophe.Builder("iq", attrs);
    }

    /** Function: $pres
     *  Create a Strophe.Builder with a <presence/> element as the root.
     *
     *  Parameters:
     *    (Object) attrs - The <presence/> element attributes in object notation.
     *
     *  Returns:
     *    A new Strophe.Builder object.
     */
    function $pres(attrs) {
        return new Strophe.Builder("presence", attrs);
    }

    /** Class: Strophe
     *  An object container for all Strophe library functions.
     *
     *  This class is just a container for all the objects and constants
     *  used in the library.  It is not meant to be instantiated, but to
     *  provide a namespace for library objects, constants, and functions.
     */
    Strophe = {
        /** Constant: VERSION
         *  The version of the Strophe library. Unreleased builds will have
         *  a version of head-HASH where HASH is a partial revision.
         */
        VERSION: "1.1.1",

        /** Constants: XMPP Namespace Constants
         *  Common namespace constants from the XMPP RFCs and XEPs.
         *
         *  NS.HTTPBIND - HTTP BIND namespace from XEP 124.
         *  NS.BOSH - BOSH namespace from XEP 206.
         *  NS.CLIENT - Main XMPP client namespace.
         *  NS.AUTH - Legacy authentication namespace.
         *  NS.ROSTER - Roster operations namespace.
         *  NS.PROFILE - Profile namespace.
         *  NS.DISCO_INFO - Service discovery info namespace from XEP 30.
         *  NS.DISCO_ITEMS - Service discovery items namespace from XEP 30.
         *  NS.MUC - Multi-User Chat namespace from XEP 45.
         *  NS.SASL - XMPP SASL namespace from RFC 3920.
         *  NS.STREAM - XMPP Streams namespace from RFC 3920.
         *  NS.BIND - XMPP Binding namespace from RFC 3920.
         *  NS.SESSION - XMPP Session namespace from RFC 3920.
         *  NS.XHTML_IM - XHTML-IM namespace from XEP 71.
         *  NS.XHTML - XHTML body namespace from XEP 71.
         */
        NS: {
            HTTPBIND: "http://jabber.org/protocol/httpbind",
            BOSH: "urn:xmpp:xbosh",
            CLIENT: "jabber:client",
            AUTH: "jabber:iq:auth",
            ROSTER: "jabber:iq:roster",
            PROFILE: "jabber:iq:profile",
            DISCO_INFO: "http://jabber.org/protocol/disco#info",
            DISCO_ITEMS: "http://jabber.org/protocol/disco#items",
            MUC: "http://jabber.org/protocol/muc",
            SASL: "urn:ietf:params:xml:ns:xmpp-sasl",
            STREAM: "http://etherx.jabber.org/streams",
            BIND: "urn:ietf:params:xml:ns:xmpp-bind",
            SESSION: "urn:ietf:params:xml:ns:xmpp-session",
            VERSION: "jabber:iq:version",
            STANZAS: "urn:ietf:params:xml:ns:xmpp-stanzas",
            XHTML_IM: "http://jabber.org/protocol/xhtml-im",
            XHTML: "http://www.w3.org/1999/xhtml"
        },


        /** Constants: XHTML_IM Namespace
         *  contains allowed tags, tag attributes, and css properties.
         *  Used in the createHtml function to filter incoming html into the allowed XHTML-IM subset.
         *  See http://xmpp.org/extensions/xep-0071.html#profile-summary for the list of recommended
         *  allowed tags and their attributes.
         */
        XHTML: {
            tags: ['a', 'blockquote', 'br', 'cite', 'em', 'img', 'li', 'ol', 'p', 'span', 'strong', 'ul', 'body'],
            attributes: {
                'a': ['href'],
                'blockquote': ['style'],
                'br': [],
                'cite': ['style'],
                'em': [],
                'img': ['src', 'alt', 'style', 'height', 'width'],
                'li': ['style'],
                'ol': ['style'],
                'p': ['style'],
                'span': ['style'],
                'strong': [],
                'ul': ['style'],
                'body': []
            },
            css: ['background-color', 'color', 'font-family', 'font-size', 'font-style', 'font-weight', 'margin-left', 'margin-right', 'text-align', 'text-decoration'],
            validTag: function (tag) {
                for (var i = 0; i < Strophe.XHTML.tags.length; i++) {
                    if (tag == Strophe.XHTML.tags[i]) {
                        return true;
                    }
                }
                return false;
            },
            validAttribute: function (tag, attribute) {
                if (typeof Strophe.XHTML.attributes[tag] !== 'undefined' && Strophe.XHTML.attributes[tag].length > 0) {
                    for (var i = 0; i < Strophe.XHTML.attributes[tag].length; i++) {
                        if (attribute == Strophe.XHTML.attributes[tag][i]) {
                            return true;
                        }
                    }
                }
                return false;
            },
            validCSS: function (style) {
                for (var i = 0; i < Strophe.XHTML.css.length; i++) {
                    if (style == Strophe.XHTML.css[i]) {
                        return true;
                    }
                }
                return false;
            }
        },

        /** Constants: Connection Status Constants
         *  Connection status constants for use by the connection handler
         *  callback.
         *
         *  Status.ERROR - An error has occurred
         *  Status.CONNECTING - The connection is currently being made
         *  Status.CONNFAIL - The connection attempt failed
         *  Status.AUTHENTICATING - The connection is authenticating
         *  Status.AUTHFAIL - The authentication attempt failed
         *  Status.CONNECTED - The connection has succeeded
         *  Status.DISCONNECTED - The connection has been terminated
         *  Status.DISCONNECTING - The connection is currently being terminated
         *  Status.ATTACHED - The connection has been attached
         */
        Status: {
            ERROR: 0,
            CONNECTING: 1,
            CONNFAIL: 2,
            AUTHENTICATING: 3,
            AUTHFAIL: 4,
            CONNECTED: 5,
            DISCONNECTED: 6,
            DISCONNECTING: 7,
            ATTACHED: 8
        },

        /** Constants: Log Level Constants
         *  Logging level indicators.
         *
         *  LogLevel.DEBUG - Debug output
         *  LogLevel.INFO - Informational output
         *  LogLevel.WARN - Warnings
         *  LogLevel.ERROR - Errors
         *  LogLevel.FATAL - Fatal errors
         */
        LogLevel: {
            DEBUG: 0,
            INFO: 1,
            WARN: 2,
            ERROR: 3,
            FATAL: 4
        },

        /** PrivateConstants: DOM Element Type Constants
         *  DOM element types.
         *
         *  ElementType.NORMAL - Normal element.
         *  ElementType.TEXT - Text data element.
         *  ElementType.FRAGMENT - XHTML fragment element.
         */
        ElementType: {
            NORMAL: 1,
            TEXT: 3,
            CDATA: 4,
            FRAGMENT: 11
        },

        /** PrivateConstants: Timeout Values
         *  Timeout values for error states.  These values are in seconds.
         *  These should not be changed unless you know exactly what you are
         *  doing.
         *
         *  TIMEOUT - Timeout multiplier. A waiting request will be considered
         *      failed after Math.floor(TIMEOUT * wait) seconds have elapsed.
         *      This defaults to 1.1, and with default wait, 66 seconds.
         *  SECONDARY_TIMEOUT - Secondary timeout multiplier. In cases where
         *      Strophe can detect early failure, it will consider the request
         *      failed if it doesn't return after
         *      Math.floor(SECONDARY_TIMEOUT * wait) seconds have elapsed.
         *      This defaults to 0.1, and with default wait, 6 seconds.
         */
        TIMEOUT: 1.1,
        SECONDARY_TIMEOUT: 0.1,

        /** Function: addNamespace
         *  This function is used to extend the current namespaces in
         *  Strophe.NS.  It takes a key and a value with the key being the
         *  name of the new namespace, with its actual value.
         *  For example:
         *  Strophe.addNamespace('PUBSUB', "http://jabber.org/protocol/pubsub");
         *
         *  Parameters:
         *    (String) name - The name under which the namespace will be
         *      referenced under Strophe.NS
         *    (String) value - The actual namespace.
         */
        addNamespace: function (name, value) {
            Strophe.NS[name] = value;
        },

        /** Function: forEachChild
         *  Map a function over some or all child elements of a given element.
         *
         *  This is a small convenience function for mapping a function over
         *  some or all of the children of an element.  If elemName is null, all
         *  children will be passed to the function, otherwise only children
         *  whose tag names match elemName will be passed.
         *
         *  Parameters:
         *    (XMLElement) elem - The element to operate on.
         *    (String) elemName - The child element tag name filter.
         *    (Function) func - The function to apply to each child.  This
         *      function should take a single argument, a DOM element.
         */
        forEachChild: function (elem, elemName, func) {
            var i, childNode;

            for (i = 0; i < elem.childNodes.length; i++) {
                childNode = elem.childNodes[i];
                if (childNode.nodeType == Strophe.ElementType.NORMAL &&
                    (!elemName || this.isTagEqual(childNode, elemName))) {
                    func(childNode);
                }
            }
        },

        /** Function: isTagEqual
         *  Compare an element's tag name with a string.
         *
         *  This function is case insensitive.
         *
         *  Parameters:
         *    (XMLElement) el - A DOM element.
         *    (String) name - The element name.
         *
         *  Returns:
         *    true if the element's tag name matches _el_, and false
         *    otherwise.
         */
        isTagEqual: function (el, name) {
            return el.tagName.toLowerCase() == name.toLowerCase();
        },

        /** PrivateVariable: _xmlGenerator
         *  _Private_ variable that caches a DOM document to
         *  generate elements.
         */
        _xmlGenerator: null,

        /** PrivateFunction: _makeGenerator
         *  _Private_ function that creates a dummy XML DOM document to serve as
         *  an element and text node generator.
         */
        _makeGenerator: function () {
            var doc;

            // IE9 does implement createDocument(); however, using it will cause the browser to leak memory on page unload.
            // Here, we test for presence of createDocument() plus IE's proprietary documentMode attribute, which would be
            // less than 10 in the case of IE9 and below.
            if (document.implementation.createDocument === undefined ||
                document.implementation.createDocument && document.documentMode && document.documentMode < 10) {
                doc = this._getIEXmlDom();
                doc.appendChild(doc.createElement('strophe'));
            } else {
                doc = document.implementation
                    .createDocument('jabber:client', 'strophe', null);
            }

            return doc;
        },

        /** Function: xmlGenerator
         *  Get the DOM document to generate elements.
         *
         *  Returns:
         *    The currently used DOM document.
         */
        xmlGenerator: function () {
            if (!Strophe._xmlGenerator) {
                Strophe._xmlGenerator = Strophe._makeGenerator();
            }
            return Strophe._xmlGenerator;
        },

        /** PrivateFunction: _getIEXmlDom
         *  Gets IE xml doc object
         *
         *  Returns:
         *    A Microsoft XML DOM Object
         *  See Also:
         *    http://msdn.microsoft.com/en-us/library/ms757837%28VS.85%29.aspx
         */
        _getIEXmlDom: function () {
            var doc = null;
            var docStrings = [
                "Msxml2.DOMDocument.6.0",
                "Msxml2.DOMDocument.5.0",
                "Msxml2.DOMDocument.4.0",
                "MSXML2.DOMDocument.3.0",
                "MSXML2.DOMDocument",
                "MSXML.DOMDocument",
                "Microsoft.XMLDOM"
            ];

            for (var d = 0; d < docStrings.length; d++) {
                if (doc === null) {
                    try {
                        doc = new ActiveXObject(docStrings[d]);
                    } catch (e) {
                        doc = null;
                    }
                } else {
                    break;
                }
            }

            return doc;
        },

        /** Function: xmlElement
         *  Create an XML DOM element.
         *
         *  This function creates an XML DOM element correctly across all
         *  implementations. Note that these are not HTML DOM elements, which
         *  aren't appropriate for XMPP stanzas.
         *
         *  Parameters:
         *    (String) name - The name for the element.
         *    (Array|Object) attrs - An optional array or object containing
         *      key/value pairs to use as element attributes. The object should
         *      be in the format {'key': 'value'} or {key: 'value'}. The array
         *      should have the format [['key1', 'value1'], ['key2', 'value2']].
         *    (String) text - The text child data for the element.
         *
         *  Returns:
         *    A new XML DOM element.
         */
        xmlElement: function (name) {
            if (!name) {
                return null;
            }

            var node = Strophe.xmlGenerator().createElement(name);

            // FIXME: this should throw errors if args are the wrong type or
            // there are more than two optional args
            var a, i, k;
            for (a = 1; a < arguments.length; a++) {
                if (!arguments[a]) {
                    continue;
                }
                if (typeof(arguments[a]) == "string" ||
                    typeof(arguments[a]) == "number") {
                    node.appendChild(Strophe.xmlTextNode(arguments[a]));
                } else if (typeof(arguments[a]) == "object" &&
                    typeof(arguments[a].sort) == "function") {
                    for (i = 0; i < arguments[a].length; i++) {
                        if (typeof(arguments[a][i]) == "object" &&
                            typeof(arguments[a][i].sort) == "function") {
                            node.setAttribute(arguments[a][i][0],
                                arguments[a][i][1]);
                        }
                    }
                } else if (typeof(arguments[a]) == "object") {
                    for (k in arguments[a]) {
                        if (arguments[a].hasOwnProperty(k)) {
                            node.setAttribute(k, arguments[a][k]);
                        }
                    }
                }
            }

            return node;
        },

        /*  Function: xmlescape
         *  Excapes invalid xml characters.
         *
         *  Parameters:
         *     (String) text - text to escape.
         *
         *  Returns:
         *      Escaped text.
         */
        xmlescape: function (text) {
            text = text.replace(/\&/g, "&amp;");
            text = text.replace(/</g, "&lt;");
            text = text.replace(/>/g, "&gt;");
            text = text.replace(/'/g, "&apos;");
            text = text.replace(/"/g, "&quot;");
            return text;
        },

        /** Function: xmlTextNode
         *  Creates an XML DOM text node.
         *
         *  Provides a cross implementation version of document.createTextNode.
         *
         *  Parameters:
         *    (String) text - The content of the text node.
         *
         *  Returns:
         *    A new XML DOM text node.
         */
        xmlTextNode: function (text) {
            return Strophe.xmlGenerator().createTextNode(text);
        },

        /** Function: xmlHtmlNode
         *  Creates an XML DOM html node.
         *
         *  Parameters:
         *    (String) html - The content of the html node.
         *
         *  Returns:
         *    A new XML DOM text node.
         */
        xmlHtmlNode: function (html) {
            //ensure text is escaped
            if (window.DOMParser) {
                parser = new DOMParser();
                node = parser.parseFromString(html, "text/xml");
            } else {
                node = new ActiveXObject("Microsoft.XMLDOM");
                node.async = "false";
                node.loadXML(html);
            }
            return node;
        },

        /** Function: getText
         *  Get the concatenation of all text children of an element.
         *
         *  Parameters:
         *    (XMLElement) elem - A DOM element.
         *
         *  Returns:
         *    A String with the concatenated text of all text element children.
         */
        getText: function (elem) {
            if (!elem) {
                return null;
            }

            var str = "";
            if (elem.childNodes.length === 0 && elem.nodeType ==
                Strophe.ElementType.TEXT) {
                str += elem.nodeValue;
            }

            for (var i = 0; i < elem.childNodes.length; i++) {
                if (elem.childNodes[i].nodeType == Strophe.ElementType.TEXT) {
                    str += elem.childNodes[i].nodeValue;
                }
            }

            return Strophe.xmlescape(str);
        },

        /** Function: copyElement
         *  Copy an XML DOM element.
         *
         *  This function copies a DOM element and all its descendants and returns
         *  the new copy.
         *
         *  Parameters:
         *    (XMLElement) elem - A DOM element.
         *
         *  Returns:
         *    A new, copied DOM element tree.
         */
        copyElement: function (elem) {
            var i, el;
            if (elem.nodeType == Strophe.ElementType.NORMAL) {
                el = Strophe.xmlElement(elem.tagName);

                for (i = 0; i < elem.attributes.length; i++) {
                    el.setAttribute(elem.attributes[i].nodeName.toLowerCase(),
                        elem.attributes[i].value);
                }

                for (i = 0; i < elem.childNodes.length; i++) {
                    el.appendChild(Strophe.copyElement(elem.childNodes[i]));
                }
            } else if (elem.nodeType == Strophe.ElementType.TEXT) {
                el = Strophe.xmlGenerator().createTextNode(elem.nodeValue);
            }

            return el;
        },


        /** Function: createHtml
         *  Copy an HTML DOM element into an XML DOM.
         *
         *  This function copies a DOM element and all its descendants and returns
         *  the new copy.
         *
         *  Parameters:
         *    (HTMLElement) elem - A DOM element.
         *
         *  Returns:
         *    A new, copied DOM element tree.
         */
        createHtml: function (elem) {
            var i, el, j, tag, attribute, value, css, cssAttrs, attr, cssName, cssValue, children, child;
            if (elem.nodeType == Strophe.ElementType.NORMAL) {
                tag = elem.nodeName.toLowerCase();
                if (Strophe.XHTML.validTag(tag)) {
                    try {
                        el = Strophe.xmlElement(tag);
                        for (i = 0; i < Strophe.XHTML.attributes[tag].length; i++) {
                            attribute = Strophe.XHTML.attributes[tag][i];
                            value = elem.getAttribute(attribute);
                            if (typeof value == 'undefined' || value === null || value === '' || value === false || value === 0) {
                                continue;
                            }
                            if (attribute == 'style' && typeof value == 'object') {
                                if (typeof value.cssText != 'undefined') {
                                    value = value.cssText; // we're dealing with IE, need to get CSS out
                                }
                            }
                            // filter out invalid css styles
                            if (attribute == 'style') {
                                css = [];
                                cssAttrs = value.split(';');
                                for (j = 0; j < cssAttrs.length; j++) {
                                    attr = cssAttrs[j].split(':');
                                    cssName = attr[0].replace(/^\s*/, "").replace(/\s*$/, "").toLowerCase();
                                    if (Strophe.XHTML.validCSS(cssName)) {
                                        cssValue = attr[1].replace(/^\s*/, "").replace(/\s*$/, "");
                                        css.push(cssName + ': ' + cssValue);
                                    }
                                }
                                if (css.length > 0) {
                                    value = css.join('; ');
                                    el.setAttribute(attribute, value);
                                }
                            } else {
                                el.setAttribute(attribute, value);
                            }
                        }

                        for (i = 0; i < elem.childNodes.length; i++) {
                            el.appendChild(Strophe.createHtml(elem.childNodes[i]));
                        }
                    } catch (e) { // invalid elements
                        el = Strophe.xmlTextNode('');
                    }
                } else {
                    el = Strophe.xmlGenerator().createDocumentFragment();
                    for (i = 0; i < elem.childNodes.length; i++) {
                        el.appendChild(Strophe.createHtml(elem.childNodes[i]));
                    }
                }
            } else if (elem.nodeType == Strophe.ElementType.FRAGMENT) {
                el = Strophe.xmlGenerator().createDocumentFragment();
                for (i = 0; i < elem.childNodes.length; i++) {
                    el.appendChild(Strophe.createHtml(elem.childNodes[i]));
                }
            } else if (elem.nodeType == Strophe.ElementType.TEXT) {
                el = Strophe.xmlTextNode(elem.nodeValue);
            }

            return el;
        },

        /** Function: escapeNode
         *  Escape the node part (also called local part) of a JID.
         *
         *  Parameters:
         *    (String) node - A node (or local part).
         *
         *  Returns:
         *    An escaped node (or local part).
         */
        escapeNode: function (node) {
            return node.replace(/^\s+|\s+$/g, '')
                .replace(/\\/g, "\\5c")
                .replace(/ /g, "\\20")
                .replace(/\"/g, "\\22")
                .replace(/\&/g, "\\26")
                .replace(/\'/g, "\\27")
                .replace(/\//g, "\\2f")
                .replace(/:/g, "\\3a")
                .replace(/</g, "\\3c")
                .replace(/>/g, "\\3e")
                .replace(/@/g, "\\40");
        },

        /** Function: unescapeNode
         *  Unescape a node part (also called local part) of a JID.
         *
         *  Parameters:
         *    (String) node - A node (or local part).
         *
         *  Returns:
         *    An unescaped node (or local part).
         */
        unescapeNode: function (node) {
            return node.replace(/\\20/g, " ")
                .replace(/\\22/g, '"')
                .replace(/\\26/g, "&")
                .replace(/\\27/g, "'")
                .replace(/\\2f/g, "/")
                .replace(/\\3a/g, ":")
                .replace(/\\3c/g, "<")
                .replace(/\\3e/g, ">")
                .replace(/\\40/g, "@")
                .replace(/\\5c/g, "\\");
        },

        /** Function: getNodeFromJid
         *  Get the node portion of a JID String.
         *
         *  Parameters:
         *    (String) jid - A JID.
         *
         *  Returns:
         *    A String containing the node.
         */
        getNodeFromJid: function (jid) {
            if (jid.indexOf("@") < 0) {
                return null;
            }
            return jid.split("@")[0];
        },

        /** Function: getDomainFromJid
         *  Get the domain portion of a JID String.
         *
         *  Parameters:
         *    (String) jid - A JID.
         *
         *  Returns:
         *    A String containing the domain.
         */
        getDomainFromJid: function (jid) {
            var bare = Strophe.getBareJidFromJid(jid);
            if (bare.indexOf("@") < 0) {
                return bare;
            } else {
                var parts = bare.split("@");
                parts.splice(0, 1);
                return parts.join('@');
            }
        },

        /** Function: getResourceFromJid
         *  Get the resource portion of a JID String.
         *
         *  Parameters:
         *    (String) jid - A JID.
         *
         *  Returns:
         *    A String containing the resource.
         */
        getResourceFromJid: function (jid) {
            var s = jid.split("/");
            if (s.length < 2) {
                return null;
            }
            s.splice(0, 1);
            return s.join('/');
        },

        /** Function: getBareJidFromJid
         *  Get the bare JID from a JID String.
         *
         *  Parameters:
         *    (String) jid - A JID.
         *
         *  Returns:
         *    A String containing the bare JID.
         */
        getBareJidFromJid: function (jid) {
            return jid ? jid.split("/")[0] : null;
        },

        /** Function: log
         *  User overrideable logging function.
         *
         *  This function is called whenever the Strophe library calls any
         *  of the logging functions.  The default implementation of this
         *  function does nothing.  If client code wishes to handle the logging
         *  messages, it should override this with
         *  > Strophe.log = function (level, msg) {
     *  >   (user code here)
     *  > };
         *
         *  Please note that data sent and received over the wire is logged
         *  via Strophe.Connection.rawInput() and Strophe.Connection.rawOutput().
         *
         *  The different levels and their meanings are
         *
         *    DEBUG - Messages useful for debugging purposes.
         *    INFO - Informational messages.  This is mostly information like
         *      'disconnect was called' or 'SASL auth succeeded'.
         *    WARN - Warnings about potential problems.  This is mostly used
         *      to report transient connection errors like request timeouts.
         *    ERROR - Some error occurred.
         *    FATAL - A non-recoverable fatal error occurred.
         *
         *  Parameters:
         *    (Integer) level - The log level of the log message.  This will
         *      be one of the values in Strophe.LogLevel.
         *    (String) msg - The log message.
         */
        log: function (level, msg) {
            return;
        },

        /** Function: debug
         *  Log a message at the Strophe.LogLevel.DEBUG level.
         *
         *  Parameters:
         *    (String) msg - The log message.
         */
        debug: function (msg) {
            this.log(this.LogLevel.DEBUG, msg);
        },

        /** Function: info
         *  Log a message at the Strophe.LogLevel.INFO level.
         *
         *  Parameters:
         *    (String) msg - The log message.
         */
        info: function (msg) {
            this.log(this.LogLevel.INFO, msg);
        },

        /** Function: warn
         *  Log a message at the Strophe.LogLevel.WARN level.
         *
         *  Parameters:
         *    (String) msg - The log message.
         */
        warn: function (msg) {
            this.log(this.LogLevel.WARN, msg);
        },

        /** Function: error
         *  Log a message at the Strophe.LogLevel.ERROR level.
         *
         *  Parameters:
         *    (String) msg - The log message.
         */
        error: function (msg) {
            this.log(this.LogLevel.ERROR, msg);
        },

        /** Function: fatal
         *  Log a message at the Strophe.LogLevel.FATAL level.
         *
         *  Parameters:
         *    (String) msg - The log message.
         */
        fatal: function (msg) {
            this.log(this.LogLevel.FATAL, msg);
        },

        /** Function: serialize
         *  Render a DOM element and all descendants to a String.
         *
         *  Parameters:
         *    (XMLElement) elem - A DOM element.
         *
         *  Returns:
         *    The serialized element tree as a String.
         */
        serialize: function (elem) {
            var result;

            if (!elem) {
                return null;
            }

            if (typeof(elem.tree) === "function") {
                elem = elem.tree();
            }

            var nodeName = elem.nodeName;
            var i, child;

            if (elem.getAttribute("_realname")) {
                nodeName = elem.getAttribute("_realname");
            }

            result = "<" + nodeName;
            for (i = 0; i < elem.attributes.length; i++) {
                if (elem.attributes[i].nodeName != "_realname") {
                    result += " " + elem.attributes[i].nodeName.toLowerCase() +
                        "='" + elem.attributes[i].value
                        .replace(/&/g, "&amp;")
                        .replace(/\'/g, "&apos;")
                        .replace(/>/g, "&gt;")
                        .replace(/</g, "&lt;") + "'";
                }
            }

            if (elem.childNodes.length > 0) {
                result += ">";
                for (i = 0; i < elem.childNodes.length; i++) {
                    child = elem.childNodes[i];
                    switch (child.nodeType) {
                        case Strophe.ElementType.NORMAL:
                            // normal element, so recurse
                            result += Strophe.serialize(child);
                            break;
                        case Strophe.ElementType.TEXT:
                            // text element to escape values
                            result += Strophe.xmlescape(child.nodeValue);
                            break;
                        case Strophe.ElementType.CDATA:
                            // cdata section so don't escape values
                            result += "<![CDATA[" + child.nodeValue + "]]>";
                    }
                }
                result += "</" + nodeName + ">";
            } else {
                result += "/>";
            }

            return result;
        },

        /** PrivateVariable: _requestId
         *  _Private_ variable that keeps track of the request ids for
         *  connections.
         */
        _requestId: 0,

        /** PrivateVariable: Strophe.connectionPlugins
         *  _Private_ variable Used to store plugin names that need
         *  initialization on Strophe.Connection construction.
         */
        _connectionPlugins: {},

        /** Function: addConnectionPlugin
         *  Extends the Strophe.Connection object with the given plugin.
         *
         *  Parameters:
         *    (String) name - The name of the extension.
         *    (Object) ptype - The plugin's prototype.
         */
        addConnectionPlugin: function (name, ptype) {
            Strophe._connectionPlugins[name] = ptype;
        }
    };

    /** Class: Strophe.Builder
     *  XML DOM builder.
     *
     *  This object provides an interface similar to JQuery but for building
     *  DOM element easily and rapidly.  All the functions except for toString()
     *  and tree() return the object, so calls can be chained.  Here's an
     *  example using the $iq() builder helper.
     *  > $iq({to: 'you', from: 'me', type: 'get', id: '1'})
     *  >     .c('query', {xmlns: 'strophe:example'})
     *  >     .c('example')
     *  >     .toString()
     *  The above generates this XML fragment
     *  > <iq to='you' from='me' type='get' id='1'>
     *  >   <query xmlns='strophe:example'>
     *  >     <example/>
     *  >   </query>
     *  > </iq>
     *  The corresponding DOM manipulations to get a similar fragment would be
     *  a lot more tedious and probably involve several helper variables.
     *
     *  Since adding children makes new operations operate on the child, up()
     *  is provided to traverse up the tree.  To add two children, do
     *  > builder.c('child1', ...).up().c('child2', ...)
     *  The next operation on the Builder will be relative to the second child.
     */

    /** Constructor: Strophe.Builder
     *  Create a Strophe.Builder object.
     *
     *  The attributes should be passed in object notation.  For example
     *  > var b = new Builder('message', {to: 'you', from: 'me'});
     *  or
     *  > var b = new Builder('messsage', {'xml:lang': 'en'});
     *
     *  Parameters:
     *    (String) name - The name of the root element.
     *    (Object) attrs - The attributes for the root element in object notation.
     *
     *  Returns:
     *    A new Strophe.Builder.
     */
    Strophe.Builder = function (name, attrs) {
        // Set correct namespace for jabber:client elements
        if (name == "presence" || name == "message" || name == "iq") {
            if (attrs && !attrs.xmlns) {
                attrs.xmlns = Strophe.NS.CLIENT;
            } else if (!attrs) {
                attrs = {xmlns: Strophe.NS.CLIENT};
            }
        }

        // Holds the tree being built.
        this.nodeTree = Strophe.xmlElement(name, attrs);

        // Points to the current operation node.
        this.node = this.nodeTree;
    };

    Strophe.Builder.prototype = {
        /** Function: tree
         *  Return the DOM tree.
         *
         *  This function returns the current DOM tree as an element object.  This
         *  is suitable for passing to functions like Strophe.Connection.send().
         *
         *  Returns:
         *    The DOM tree as a element object.
         */
        tree: function () {
            return this.nodeTree;
        },

        /** Function: toString
         *  Serialize the DOM tree to a String.
         *
         *  This function returns a string serialization of the current DOM
         *  tree.  It is often used internally to pass data to a
         *  Strophe.Request object.
         *
         *  Returns:
         *    The serialized DOM tree in a String.
         */
        toString: function () {
            return Strophe.serialize(this.nodeTree);
        },

        /** Function: up
         *  Make the current parent element the new current element.
         *
         *  This function is often used after c() to traverse back up the tree.
         *  For example, to add two children to the same element
         *  > builder.c('child1', {}).up().c('child2', {});
         *
         *  Returns:
         *    The Stophe.Builder object.
         */
        up: function () {
            this.node = this.node.parentNode;
            return this;
        },

        /** Function: attrs
         *  Add or modify attributes of the current element.
         *
         *  The attributes should be passed in object notation.  This function
         *  does not move the current element pointer.
         *
         *  Parameters:
         *    (Object) moreattrs - The attributes to add/modify in object notation.
         *
         *  Returns:
         *    The Strophe.Builder object.
         */
        attrs: function (moreattrs) {
            for (var k in moreattrs) {
                if (moreattrs.hasOwnProperty(k)) {
                    this.node.setAttribute(k, moreattrs[k]);
                }
            }
            return this;
        },

        /** Function: c
         *  Add a child to the current element and make it the new current
         *  element.
         *
         *  This function moves the current element pointer to the child,
         *  unless text is provided.  If you need to add another child, it
         *  is necessary to use up() to go back to the parent in the tree.
         *
         *  Parameters:
         *    (String) name - The name of the child.
         *    (Object) attrs - The attributes of the child in object notation.
         *    (String) text - The text to add to the child.
         *
         *  Returns:
         *    The Strophe.Builder object.
         */
        c: function (name, attrs, text) {
            var child = Strophe.xmlElement(name, attrs, text);
            this.node.appendChild(child);
            if (!text) {
                this.node = child;
            }
            return this;
        },

        /** Function: cnode
         *  Add a child to the current element and make it the new current
         *  element.
         *
         *  This function is the same as c() except that instead of using a
         *  name and an attributes object to create the child it uses an
         *  existing DOM element object.
         *
         *  Parameters:
         *    (XMLElement) elem - A DOM element.
         *
         *  Returns:
         *    The Strophe.Builder object.
         */
        cnode: function (elem) {
            var impNode;
            var xmlGen = Strophe.xmlGenerator();
            try {
                impNode = (xmlGen.importNode !== undefined);
            }
            catch (e) {
                impNode = false;
            }
            var newElem = impNode ?
                xmlGen.importNode(elem, true) :
                Strophe.copyElement(elem);
            this.node.appendChild(newElem);
            this.node = newElem;
            return this;
        },

        /** Function: t
         *  Add a child text element.
         *
         *  This *does not* make the child the new current element since there
         *  are no children of text elements.
         *
         *  Parameters:
         *    (String) text - The text data to append to the current element.
         *
         *  Returns:
         *    The Strophe.Builder object.
         */
        t: function (text) {
            var child = Strophe.xmlTextNode(text);
            this.node.appendChild(child);
            return this;
        },

        /** Function: h
         *  Replace current element contents with the HTML passed in.
         *
         *  This *does not* make the child the new current element
         *
         *  Parameters:
         *    (String) html - The html to insert as contents of current element.
         *
         *  Returns:
         *    The Strophe.Builder object.
         */
        h: function (html) {
            var fragment = document.createElement('body');

            // force the browser to try and fix any invalid HTML tags
            fragment.innerHTML = html;

            // copy cleaned html into an xml dom
            var xhtml = Strophe.createHtml(fragment);

            while (xhtml.childNodes.length > 0) {
                this.node.appendChild(xhtml.childNodes[0]);
            }
            return this;
        }
    };

    /** PrivateClass: Strophe.Handler
     *  _Private_ helper class for managing stanza handlers.
     *
     *  A Strophe.Handler encapsulates a user provided callback function to be
     *  executed when matching stanzas are received by the connection.
     *  Handlers can be either one-off or persistant depending on their
     *  return value. Returning true will cause a Handler to remain active, and
     *  returning false will remove the Handler.
     *
     *  Users will not use Strophe.Handler objects directly, but instead they
     *  will use Strophe.Connection.addHandler() and
     *  Strophe.Connection.deleteHandler().
     */

    /** PrivateConstructor: Strophe.Handler
     *  Create and initialize a new Strophe.Handler.
     *
     *  Parameters:
     *    (Function) handler - A function to be executed when the handler is run.
     *    (String) ns - The namespace to match.
     *    (String) name - The element name to match.
     *    (String) type - The element type to match.
     *    (String) id - The element id attribute to match.
     *    (String) from - The element from attribute to match.
     *    (Object) options - Handler options
     *
     *  Returns:
     *    A new Strophe.Handler object.
     */
    Strophe.Handler = function (handler, ns, name, type, id, from, options) {
        this.handler = handler;
        this.ns = ns;
        this.name = name;
        this.type = type;
        this.id = id;
        this.options = options || {matchBare: false};

        // default matchBare to false if undefined
        if (!this.options.matchBare) {
            this.options.matchBare = false;
        }

        if (this.options.matchBare) {
            this.from = from ? Strophe.getBareJidFromJid(from) : null;
        } else {
            this.from = from;
        }

        // whether the handler is a user handler or a system handler
        this.user = true;
    };

    Strophe.Handler.prototype = {
        /** PrivateFunction: isMatch
         *  Tests if a stanza matches the Strophe.Handler.
         *
         *  Parameters:
         *    (XMLElement) elem - The XML element to test.
         *
         *  Returns:
         *    true if the stanza matches and false otherwise.
         */
        isMatch: function (elem) {
            var nsMatch;
            var from = null;

            if (this.options.matchBare) {
                from = Strophe.getBareJidFromJid(elem.getAttribute('from'));
            } else {
                from = elem.getAttribute('from');
            }

            nsMatch = false;
            if (!this.ns) {
                nsMatch = true;
            } else {
                var that = this;
                Strophe.forEachChild(elem, null, function (elem) {
                    if (elem.getAttribute("xmlns") == that.ns) {
                        nsMatch = true;
                    }
                });

                nsMatch = nsMatch || elem.getAttribute("xmlns") == this.ns;
            }

            if (nsMatch &&
                (!this.name || Strophe.isTagEqual(elem, this.name)) &&
                (!this.type || elem.getAttribute("type") == this.type) &&
                (!this.id || elem.getAttribute("id") == this.id) &&
                (!this.from || from == this.from)) {
                return true;
            }

            return false;
        },

        /** PrivateFunction: run
         *  Run the callback on a matching stanza.
         *
         *  Parameters:
         *    (XMLElement) elem - The DOM element that triggered the
         *      Strophe.Handler.
         *
         *  Returns:
         *    A boolean indicating if the handler should remain active.
         */
        run: function (elem) {
            var result = null;
            try {
                result = this.handler(elem);
            } catch (e) {
                if (e.sourceURL) {
                    Strophe.fatal("error: " + this.handler +
                        " " + e.sourceURL + ":" +
                        e.line + " - " + e.name + ": " + e.message);
                } else if (e.fileName) {
                    if (typeof(console) != "undefined") {
                        console.trace();
                        console.error(this.handler, " - error - ", e, e.message);
                    }
                    Strophe.fatal("error: " + this.handler + " " +
                        e.fileName + ":" + e.lineNumber + " - " +
                        e.name + ": " + e.message);
                } else {
                    Strophe.fatal("error: " + e.message + "\n" + e.stack);
                }

                throw e;
            }

            return result;
        },

        /** PrivateFunction: toString
         *  Get a String representation of the Strophe.Handler object.
         *
         *  Returns:
         *    A String.
         */
        toString: function () {
            return "{Handler: " + this.handler + "(" + this.name + "," +
                this.id + "," + this.ns + ")}";
        }
    };

    /** PrivateClass: Strophe.TimedHandler
     *  _Private_ helper class for managing timed handlers.
     *
     *  A Strophe.TimedHandler encapsulates a user provided callback that
     *  should be called after a certain period of time or at regular
     *  intervals.  The return value of the callback determines whether the
     *  Strophe.TimedHandler will continue to fire.
     *
     *  Users will not use Strophe.TimedHandler objects directly, but instead
     *  they will use Strophe.Connection.addTimedHandler() and
     *  Strophe.Connection.deleteTimedHandler().
     */

    /** PrivateConstructor: Strophe.TimedHandler
     *  Create and initialize a new Strophe.TimedHandler object.
     *
     *  Parameters:
     *    (Integer) period - The number of milliseconds to wait before the
     *      handler is called.
     *    (Function) handler - The callback to run when the handler fires.  This
     *      function should take no arguments.
     *
     *  Returns:
     *    A new Strophe.TimedHandler object.
     */
    Strophe.TimedHandler = function (period, handler) {
        this.period = period;
        this.handler = handler;

        this.lastCalled = new Date().getTime();
        this.user = true;
    };

    Strophe.TimedHandler.prototype = {
        /** PrivateFunction: run
         *  Run the callback for the Strophe.TimedHandler.
         *
         *  Returns:
         *    true if the Strophe.TimedHandler should be called again, and false
         *      otherwise.
         */
        run: function () {
            this.lastCalled = new Date().getTime();
            return this.handler();
        },

        /** PrivateFunction: reset
         *  Reset the last called time for the Strophe.TimedHandler.
         */
        reset: function () {
            this.lastCalled = new Date().getTime();
        },

        /** PrivateFunction: toString
         *  Get a string representation of the Strophe.TimedHandler object.
         *
         *  Returns:
         *    The string representation.
         */
        toString: function () {
            return "{TimedHandler: " + this.handler + "(" + this.period + ")}";
        }
    };

    /** Class: Strophe.Connection
     *  XMPP Connection manager.
     *
     *  This class is the main part of Strophe.  It manages a BOSH connection
     *  to an XMPP server and dispatches events to the user callbacks as
     *  data arrives.  It supports SASL PLAIN, SASL DIGEST-MD5, SASL SCRAM-SHA1
     *  and legacy authentication.
     *
     *  After creating a Strophe.Connection object, the user will typically
     *  call connect() with a user supplied callback to handle connection level
     *  events like authentication failure, disconnection, or connection
     *  complete.
     *
     *  The user will also have several event handlers defined by using
     *  addHandler() and addTimedHandler().  These will allow the user code to
     *  respond to interesting stanzas or do something periodically with the
     *  connection.  These handlers will be active once authentication is
     *  finished.
     *
     *  To send data to the connection, use send().
     */

    /** Constructor: Strophe.Connection
     *  Create and initialize a Strophe.Connection object.
     *
     *  The transport-protocol for this connection will be chosen automatically
     *  based on the given service parameter. URLs starting with "ws://" or
     *  "wss://" will use WebSockets, URLs starting with "http://", "https://"
     *  or without a protocol will use BOSH.
     *
     *  To make Strophe connect to the current host you can leave out the protocol
     *  and host part and just pass the path, e.g.
     *
     *  > var conn = new Strophe.Connection("/http-bind/");
     *
     *  If you want to connect to the current host with a WebSocket connection you
     *  can tell Strophe to use WebSockets through a "protocol" attribute in the
     *  optional options parameter. Valid values are "ws" for WebSocket and "wss"
     *  for Secure WebSocket.
     *  So to connect to "wss://CURRENT_HOSTNAME/xmpp-websocket" you would call
     *
     *  > var conn = new Strophe.Connection("/xmpp-websocket/", {protocol: "wss"});
     *
     *  Note that relative URLs starting _NOT_ with a "/" will also include the path
     *  of the current site.
     *
     *  Also because downgrading security is not permitted by browsers, when using
     *  relative URLs both BOSH and WebSocket connections will use their secure
     *  variants if the current connection to the site is also secure (https).
     *
     *  Parameters:
     *    (String) service - The BOSH or WebSocket service URL.
     *    (Object) options - A hash of configuration options
     *
     *  Returns:
     *    A new Strophe.Connection object.
     */
    Strophe.Connection = function (service, options) {
        // The service URL
        this.service = service;

        // Configuration options
        this._options = options || {};
        var proto = this._options.protocol || "";

        // Select protocal based on service or options
        if (service.indexOf("ws:") === 0 || service.indexOf("wss:") === 0 ||
            proto.indexOf("ws") === 0) {
            this._proto = new Strophe.Websocket(this);
        } else {
            this._proto = new Strophe.Bosh(this);
        }
        /* The connected JID. */
        this.jid = "";
        /* the JIDs domain */
        this.domain = null;
        /* stream:features */
        this.features = null;

        // SASL
        this._sasl_data = {};
        this.do_session = false;
        this.do_bind = false;

        // handler lists
        this.timedHandlers = [];
        this.handlers = [];
        this.removeTimeds = [];
        this.removeHandlers = [];
        this.addTimeds = [];
        this.addHandlers = [];

        this._authentication = {};
        this._idleTimeout = null;
        this._disconnectTimeout = null;

        this.do_authentication = true;
        this.authenticated = false;
        this.disconnecting = false;
        this.connected = false;

        this.errors = 0;

        this.paused = false;

        this._data = [];
        this._uniqueId = 0;

        this._sasl_success_handler = null;
        this._sasl_failure_handler = null;
        this._sasl_challenge_handler = null;

        // Max retries before disconnecting
        this.maxRetries = 5;

        // setup onIdle callback every 1/10th of a second
        this._idleTimeout = setTimeout(this._onIdle.bind(this), 100);

        // initialize plugins
        for (var k in Strophe._connectionPlugins) {
            if (Strophe._connectionPlugins.hasOwnProperty(k)) {
                var ptype = Strophe._connectionPlugins[k];
                // jslint complaints about the below line, but this is fine
                var F = function () {
                };
                F.prototype = ptype;
                this[k] = new F();
                this[k].init(this);
            }
        }
    };

    Strophe.Connection.prototype = {
        /** Function: reset
         *  Reset the connection.
         *
         *  This function should be called after a connection is disconnected
         *  before that connection is reused.
         */
        reset: function () {
            this._proto._reset();

            // SASL
            this.do_session = false;
            this.do_bind = false;

            // handler lists
            this.timedHandlers = [];
            this.handlers = [];
            this.removeTimeds = [];
            this.removeHandlers = [];
            this.addTimeds = [];
            this.addHandlers = [];
            this._authentication = {};

            this.authenticated = false;
            this.disconnecting = false;
            this.connected = false;

            this.errors = 0;

            this._requests = [];
            this._uniqueId = 0;
        },

        /** Function: pause
         *  Pause the request manager.
         *
         *  This will prevent Strophe from sending any more requests to the
         *  server.  This is very useful for temporarily pausing
         *  BOSH-Connections while a lot of send() calls are happening quickly.
         *  This causes Strophe to send the data in a single request, saving
         *  many request trips.
         */
        pause: function () {
            this.paused = true;
        },

        /** Function: resume
         *  Resume the request manager.
         *
         *  This resumes after pause() has been called.
         */
        resume: function () {
            this.paused = false;
        },

        /** Function: getUniqueId
         *  Generate a unique ID for use in <iq/> elements.
         *
         *  All <iq/> stanzas are required to have unique id attributes.  This
         *  function makes creating these easy.  Each connection instance has
         *  a counter which starts from zero, and the value of this counter
         *  plus a colon followed by the suffix becomes the unique id. If no
         *  suffix is supplied, the counter is used as the unique id.
         *
         *  Suffixes are used to make debugging easier when reading the stream
         *  data, and their use is recommended.  The counter resets to 0 for
         *  every new connection for the same reason.  For connections to the
         *  same server that authenticate the same way, all the ids should be
         *  the same, which makes it easy to see changes.  This is useful for
         *  automated testing as well.
         *
         *  Parameters:
         *    (String) suffix - A optional suffix to append to the id.
         *
         *  Returns:
         *    A unique string to be used for the id attribute.
         */
        getUniqueId: function (suffix) {
            if (typeof(suffix) == "string" || typeof(suffix) == "number") {
                return ++this._uniqueId + ":" + suffix;
            } else {
                return ++this._uniqueId + "";
            }
        },

        /** Function: connect
         *  Starts the connection process.
         *
         *  As the connection process proceeds, the user supplied callback will
         *  be triggered multiple times with status updates.  The callback
         *  should take two arguments - the status code and the error condition.
         *
         *  The status code will be one of the values in the Strophe.Status
         *  constants.  The error condition will be one of the conditions
         *  defined in RFC 3920 or the condition 'strophe-parsererror'.
         *
         *  The Parameters _wait_, _hold_ and _route_ are optional and only relevant
         *  for BOSH connections. Please see XEP 124 for a more detailed explanation
         *  of the optional parameters.
         *
         *  Parameters:
         *    (String) jid - The user's JID.  This may be a bare JID,
         *      or a full JID.  If a node is not supplied, SASL ANONYMOUS
         *      authentication will be attempted.
         *    (String) pass - The user's password.
         *    (Function) callback - The connect callback function.
         *    (Integer) wait - The optional HTTPBIND wait value.  This is the
         *      time the server will wait before returning an empty result for
         *      a request.  The default setting of 60 seconds is recommended.
         *    (Integer) hold - The optional HTTPBIND hold value.  This is the
         *      number of connections the server will hold at one time.  This
         *      should almost always be set to 1 (the default).
         *    (String) route - The optional route value.
         */
        connect: function (jid, pass, callback, wait, hold, route) {
            this.jid = jid;
            /** Variable: authzid
             *  Authorization identity.
             */
            this.authzid = Strophe.getBareJidFromJid(this.jid);
            /** Variable: authcid
             *  Authentication identity (User name).
             */
            this.authcid = Strophe.getNodeFromJid(this.jid);
            /** Variable: pass
             *  Authentication identity (User password).
             */
            this.pass = pass;
            /** Variable: servtype
             *  Digest MD5 compatibility.
             */
            this.servtype = "xmpp";
            this.connect_callback = callback;
            this.disconnecting = false;
            this.connected = false;
            this.authenticated = false;
            this.errors = 0;

            // parse jid for domain and resource
            this.domain = this.domain || Strophe.getDomainFromJid(this.jid);

            this._changeConnectStatus(Strophe.Status.CONNECTING, null);

            this._proto._connect(wait, hold, route);
        },

        /** Function: attach
         *  Attach to an already created and authenticated BOSH session.
         *
         *  This function is provided to allow Strophe to attach to BOSH
         *  sessions which have been created externally, perhaps by a Web
         *  application.  This is often used to support auto-login type features
         *  without putting user credentials into the page.
         *
         *  Parameters:
         *    (String) jid - The full JID that is bound by the session.
         *    (String) sid - The SID of the BOSH session.
         *    (String) rid - The current RID of the BOSH session.  This RID
         *      will be used by the next request.
         *    (Function) callback The connect callback function.
         *    (Integer) wait - The optional HTTPBIND wait value.  This is the
         *      time the server will wait before returning an empty result for
         *      a request.  The default setting of 60 seconds is recommended.
         *      Other settings will require tweaks to the Strophe.TIMEOUT value.
         *    (Integer) hold - The optional HTTPBIND hold value.  This is the
         *      number of connections the server will hold at one time.  This
         *      should almost always be set to 1 (the default).
         *    (Integer) wind - The optional HTTBIND window value.  This is the
         *      allowed range of request ids that are valid.  The default is 5.
         */
        attach: function (jid, sid, rid, callback, wait, hold, wind) {
            this._proto._attach(jid, sid, rid, callback, wait, hold, wind);
        },

        /** Function: xmlInput
         *  User overrideable function that receives XML data coming into the
         *  connection.
         *
         *  The default function does nothing.  User code can override this with
         *  > Strophe.Connection.xmlInput = function (elem) {
     *  >   (user code)
     *  > };
         *
         *  Due to limitations of current Browsers' XML-Parsers the opening and closing
         *  <stream> tag for WebSocket-Connoctions will be passed as selfclosing here.
         *
         *  BOSH-Connections will have all stanzas wrapped in a <body> tag. See
         *  <Strophe.Bosh.strip> if you want to strip this tag.
         *
         *  Parameters:
         *    (XMLElement) elem - The XML data received by the connection.
         */
        xmlInput: function (elem) {
            return;
        },

        /** Function: xmlOutput
         *  User overrideable function that receives XML data sent to the
         *  connection.
         *
         *  The default function does nothing.  User code can override this with
         *  > Strophe.Connection.xmlOutput = function (elem) {
     *  >   (user code)
     *  > };
         *
         *  Due to limitations of current Browsers' XML-Parsers the opening and closing
         *  <stream> tag for WebSocket-Connoctions will be passed as selfclosing here.
         *
         *  BOSH-Connections will have all stanzas wrapped in a <body> tag. See
         *  <Strophe.Bosh.strip> if you want to strip this tag.
         *
         *  Parameters:
         *    (XMLElement) elem - The XMLdata sent by the connection.
         */
        xmlOutput: function (elem) {
            return;
        },

        /** Function: rawInput
         *  User overrideable function that receives raw data coming into the
         *  connection.
         *
         *  The default function does nothing.  User code can override this with
         *  > Strophe.Connection.rawInput = function (data) {
     *  >   (user code)
     *  > };
         *
         *  Parameters:
         *    (String) data - The data received by the connection.
         */
        rawInput: function (data) {
            return;
        },

        /** Function: rawOutput
         *  User overrideable function that receives raw data sent to the
         *  connection.
         *
         *  The default function does nothing.  User code can override this with
         *  > Strophe.Connection.rawOutput = function (data) {
     *  >   (user code)
     *  > };
         *
         *  Parameters:
         *    (String) data - The data sent by the connection.
         */
        rawOutput: function (data) {
            return;
        },

        /** Function: send
         *  Send a stanza.
         *
         *  This function is called to push data onto the send queue to
         *  go out over the wire.  Whenever a request is sent to the BOSH
         *  server, all pending data is sent and the queue is flushed.
         *
         *  Parameters:
         *    (XMLElement |
         *     [XMLElement] |
         *     Strophe.Builder) elem - The stanza to send.
         */
        send: function (elem) {
            if (elem === null) {
                return;
            }
            if (typeof(elem.sort) === "function") {
                for (var i = 0; i < elem.length; i++) {
                    this._queueData(elem[i]);
                }
            } else if (typeof(elem.tree) === "function") {
                this._queueData(elem.tree());
            } else {
                this._queueData(elem);
            }

            this._proto._send();
        },

        /** Function: flush
         *  Immediately send any pending outgoing data.
         *
         *  Normally send() queues outgoing data until the next idle period
         *  (100ms), which optimizes network use in the common cases when
         *  several send()s are called in succession. flush() can be used to
         *  immediately send all pending data.
         */
        flush: function () {
            // cancel the pending idle period and run the idle function
            // immediately
            clearTimeout(this._idleTimeout);
            this._onIdle();
        },

        /** Function: sendIQ
         *  Helper function to send IQ stanzas.
         *
         *  Parameters:
         *    (XMLElement) elem - The stanza to send.
         *    (Function) callback - The callback function for a successful request.
         *    (Function) errback - The callback function for a failed or timed
         *      out request.  On timeout, the stanza will be null.
         *    (Integer) timeout - The time specified in milliseconds for a
         *      timeout to occur.
         *
         *  Returns:
         *    The id used to send the IQ.
         */
        sendIQ: function (elem, callback, errback, timeout) {
            var timeoutHandler = null;
            var that = this;

            if (typeof(elem.tree) === "function") {
                elem = elem.tree();
            }
            var id = elem.getAttribute('id');

            // inject id if not found
            if (!id) {
                id = this.getUniqueId("sendIQ");
                elem.setAttribute("id", id);
            }

            var handler = this.addHandler(function (stanza) {
                // remove timeout handler if there is one
                if (timeoutHandler) {
                    that.deleteTimedHandler(timeoutHandler);
                }

                var iqtype = stanza.getAttribute('type');
                if (iqtype == 'result') {
                    if (callback) {
                        callback(stanza);
                    }
                } else if (iqtype == 'error') {
                    if (errback) {
                        errback(stanza);
                    }
                } else {
                    throw {
                        name: "StropheError",
                        message: "Got bad IQ type of " + iqtype
                    };
                }
            }, null, 'iq', null, id);

            // if timeout specified, setup timeout handler.
            if (timeout) {
                timeoutHandler = this.addTimedHandler(timeout, function () {
                    // get rid of normal handler
                    that.deleteHandler(handler);

                    // call errback on timeout with null stanza
                    if (errback) {
                        errback(null);
                    }
                    return false;
                });
            }

            this.send(elem);

            return id;
        },

        /** PrivateFunction: _queueData
         *  Queue outgoing data for later sending.  Also ensures that the data
         *  is a DOMElement.
         */
        _queueData: function (element) {
            if (element === null || !element.tagName || !element.childNodes) {
                throw {
                    name: "StropheError",
                    message: "Cannot queue non-DOMElement."
                };
            }

            this._data.push(element);
        },

        /** PrivateFunction: _sendRestart
         *  Send an xmpp:restart stanza.
         */
        _sendRestart: function () {
            this._data.push("restart");

            this._proto._sendRestart();

            this._idleTimeout = setTimeout(this._onIdle.bind(this), 100);
        },

        /** Function: addTimedHandler
         *  Add a timed handler to the connection.
         *
         *  This function adds a timed handler.  The provided handler will
         *  be called every period milliseconds until it returns false,
         *  the connection is terminated, or the handler is removed.  Handlers
         *  that wish to continue being invoked should return true.
         *
         *  Because of method binding it is necessary to save the result of
         *  this function if you wish to remove a handler with
         *  deleteTimedHandler().
         *
         *  Note that user handlers are not active until authentication is
         *  successful.
         *
         *  Parameters:
         *    (Integer) period - The period of the handler.
         *    (Function) handler - The callback function.
         *
         *  Returns:
         *    A reference to the handler that can be used to remove it.
         */
        addTimedHandler: function (period, handler) {
            var thand = new Strophe.TimedHandler(period, handler);
            this.addTimeds.push(thand);
            return thand;
        },

        /** Function: deleteTimedHandler
         *  Delete a timed handler for a connection.
         *
         *  This function removes a timed handler from the connection.  The
         *  handRef parameter is *not* the function passed to addTimedHandler(),
         *  but is the reference returned from addTimedHandler().
         *
         *  Parameters:
         *    (Strophe.TimedHandler) handRef - The handler reference.
         */
        deleteTimedHandler: function (handRef) {
            // this must be done in the Idle loop so that we don't change
            // the handlers during iteration
            this.removeTimeds.push(handRef);
        },

        /** Function: addHandler
         *  Add a stanza handler for the connection.
         *
         *  This function adds a stanza handler to the connection.  The
         *  handler callback will be called for any stanza that matches
         *  the parameters.  Note that if multiple parameters are supplied,
         *  they must all match for the handler to be invoked.
         *
         *  The handler will receive the stanza that triggered it as its argument.
         *  The handler should return true if it is to be invoked again;
         *  returning false will remove the handler after it returns.
         *
         *  As a convenience, the ns parameters applies to the top level element
         *  and also any of its immediate children.  This is primarily to make
         *  matching /iq/query elements easy.
         *
         *  The options argument contains handler matching flags that affect how
         *  matches are determined. Currently the only flag is matchBare (a
         *  boolean). When matchBare is true, the from parameter and the from
         *  attribute on the stanza will be matched as bare JIDs instead of
         *  full JIDs. To use this, pass {matchBare: true} as the value of
         *  options. The default value for matchBare is false.
         *
         *  The return value should be saved if you wish to remove the handler
         *  with deleteHandler().
         *
         *  Parameters:
         *    (Function) handler - The user callback.
         *    (String) ns - The namespace to match.
         *    (String) name - The stanza name to match.
         *    (String) type - The stanza type attribute to match.
         *    (String) id - The stanza id attribute to match.
         *    (String) from - The stanza from attribute to match.
         *    (String) options - The handler options
         *
         *  Returns:
         *    A reference to the handler that can be used to remove it.
         */
        addHandler: function (handler, ns, name, type, id, from, options) {
            var hand = new Strophe.Handler(handler, ns, name, type, id, from, options);
            this.addHandlers.push(hand);
            return hand;
        },

        /** Function: deleteHandler
         *  Delete a stanza handler for a connection.
         *
         *  This function removes a stanza handler from the connection.  The
         *  handRef parameter is *not* the function passed to addHandler(),
         *  but is the reference returned from addHandler().
         *
         *  Parameters:
         *    (Strophe.Handler) handRef - The handler reference.
         */
        deleteHandler: function (handRef) {
            // this must be done in the Idle loop so that we don't change
            // the handlers during iteration
            this.removeHandlers.push(handRef);
        },

        /** Function: disconnect
         *  Start the graceful disconnection process.
         *
         *  This function starts the disconnection process.  This process starts
         *  by sending unavailable presence and sending BOSH body of type
         *  terminate.  A timeout handler makes sure that disconnection happens
         *  even if the BOSH server does not respond.
         *
         *  The user supplied connection callback will be notified of the
         *  progress as this process happens.
         *
         *  Parameters:
         *    (String) reason - The reason the disconnect is occuring.
         */
        disconnect: function (reason) {
            this._changeConnectStatus(Strophe.Status.DISCONNECTING, reason);

            Strophe.info("Disconnect was called because: " + reason);
            if (this.connected) {
                var pres = false;
                this.disconnecting = true;
                if (this.authenticated) {
                    pres = $pres({
                        xmlns: Strophe.NS.CLIENT,
                        type: 'unavailable'
                    });
                }
                // setup timeout handler
                this._disconnectTimeout = this._addSysTimedHandler(
                    3000, this._onDisconnectTimeout.bind(this));
                this._proto._disconnect(pres);
            }
        },

        /** PrivateFunction: _changeConnectStatus
         *  _Private_ helper function that makes sure plugins and the user's
         *  callback are notified of connection status changes.
         *
         *  Parameters:
         *    (Integer) status - the new connection status, one of the values
         *      in Strophe.Status
         *    (String) condition - the error condition or null
         */
        _changeConnectStatus: function (status, condition) {
            // notify all plugins listening for status changes
            for (var k in Strophe._connectionPlugins) {
                if (Strophe._connectionPlugins.hasOwnProperty(k)) {
                    var plugin = this[k];
                    if (plugin.statusChanged) {
                        try {
                            plugin.statusChanged(status, condition);
                        } catch (err) {
                            Strophe.error("" + k + " plugin caused an exception " +
                                "changing status: " + err);
                        }
                    }
                }
            }

            // notify the user's callback
            if (this.connect_callback) {
                try {
                    this.connect_callback(status, condition);
                } catch (e) {
                    Strophe.error("User connection callback caused an " +
                        "exception: " + e);
                }
            }
        },

        /** PrivateFunction: _doDisconnect
         *  _Private_ function to disconnect.
         *
         *  This is the last piece of the disconnection logic.  This resets the
         *  connection and alerts the user's connection callback.
         */
        _doDisconnect: function () {
            // Cancel Disconnect Timeout
            if (this._disconnectTimeout !== null) {
                this.deleteTimedHandler(this._disconnectTimeout);
                this._disconnectTimeout = null;
            }

            Strophe.info("_doDisconnect was called");
            this._proto._doDisconnect();

            this.authenticated = false;
            this.disconnecting = false;

            // delete handlers
            this.handlers = [];
            this.timedHandlers = [];
            this.removeTimeds = [];
            this.removeHandlers = [];
            this.addTimeds = [];
            this.addHandlers = [];

            // tell the parent we disconnected
            this._changeConnectStatus(Strophe.Status.DISCONNECTED, null);
            this.connected = false;
        },

        /** PrivateFunction: _dataRecv
         *  _Private_ handler to processes incoming data from the the connection.
         *
         *  Except for _connect_cb handling the initial connection request,
         *  this function handles the incoming data for all requests.  This
         *  function also fires stanza handlers that match each incoming
         *  stanza.
         *
         *  Parameters:
         *    (Strophe.Request) req - The request that has data ready.
         *    (string) req - The stanza a raw string (optiona).
         */
        _dataRecv: function (req, raw) {
            Strophe.info("_dataRecv called");
            var elem = this._proto._reqToData(req);
            if (elem === null) {
                return;
            }

            if (this.xmlInput !== Strophe.Connection.prototype.xmlInput) {
                if (elem.nodeName === this._proto.strip && elem.childNodes.length) {
                    this.xmlInput(elem.childNodes[0]);
                } else {
                    this.xmlInput(elem);
                }
            }
            if (this.rawInput !== Strophe.Connection.prototype.rawInput) {
                if (raw) {
                    this.rawInput(raw);
                } else {
                    this.rawInput(Strophe.serialize(elem));
                }
            }

            // remove handlers scheduled for deletion
            var i, hand;
            while (this.removeHandlers.length > 0) {
                hand = this.removeHandlers.pop();
                i = this.handlers.indexOf(hand);
                if (i >= 0) {
                    this.handlers.splice(i, 1);
                }
            }

            // add handlers scheduled for addition
            while (this.addHandlers.length > 0) {
                this.handlers.push(this.addHandlers.pop());
            }

            // handle graceful disconnect
            if (this.disconnecting && this._proto._emptyQueue()) {
                this._doDisconnect();
                return;
            }

            var typ = elem.getAttribute("type");
            var cond, conflict;
            if (typ !== null && typ == "terminate") {
                // Don't process stanzas that come in after disconnect
                if (this.disconnecting) {
                    return;
                }

                // an error occurred
                cond = elem.getAttribute("condition");
                conflict = elem.getElementsByTagName("conflict");
                if (cond !== null) {
                    if (cond == "remote-stream-error" && conflict.length > 0) {
                        cond = "conflict";
                    }
                    this._changeConnectStatus(Strophe.Status.CONNFAIL, cond);
                } else {
                    this._changeConnectStatus(Strophe.Status.CONNFAIL, "unknown");
                }
                this.disconnect('unknown stream-error');
                return;
            }

            // send each incoming stanza through the handler chain
            var that = this;
            Strophe.forEachChild(elem, null, function (child) {
                var i, newList;
                // process handlers
                newList = that.handlers;
                that.handlers = [];
                for (i = 0; i < newList.length; i++) {
                    var hand = newList[i];
                    // encapsulate 'handler.run' not to lose the whole handler list if
                    // one of the handlers throws an exception
                    try {
                        if (hand.isMatch(child) &&
                            (that.authenticated || !hand.user)) {
                            if (hand.run(child)) {
                                that.handlers.push(hand);
                            }
                        } else {
                            that.handlers.push(hand);
                        }
                    } catch (e) {
                        // if the handler throws an exception, we consider it as false
                        Strophe.warn('Removing Strophe handlers due to uncaught exception: ' + e.message);
                    }
                }
            });
        },


        /** Attribute: mechanisms
         *  SASL Mechanisms available for Conncection.
         */
        mechanisms: {},

        /** PrivateFunction: _connect_cb
         *  _Private_ handler for initial connection request.
         *
         *  This handler is used to process the initial connection request
         *  response from the BOSH server. It is used to set up authentication
         *  handlers and start the authentication process.
         *
         *  SASL authentication will be attempted if available, otherwise
         *  the code will fall back to legacy authentication.
         *
         *  Parameters:
         *    (Strophe.Request) req - The current request.
         *    (Function) _callback - low level (xmpp) connect callback function.
         *      Useful for plugins with their own xmpp connect callback (when their)
         *      want to do something special).
         */
        _connect_cb: function (req, _callback, raw) {
            Strophe.info("_connect_cb was called");

            this.connected = true;

            var bodyWrap = this._proto._reqToData(req);
            if (!bodyWrap) {
                return;
            }

            if (this.xmlInput !== Strophe.Connection.prototype.xmlInput) {
                if (bodyWrap.nodeName === this._proto.strip && bodyWrap.childNodes.length) {
                    this.xmlInput(bodyWrap.childNodes[0]);
                } else {
                    this.xmlInput(bodyWrap);
                }
            }
            if (this.rawInput !== Strophe.Connection.prototype.rawInput) {
                if (raw) {
                    this.rawInput(raw);
                } else {
                    this.rawInput(Strophe.serialize(bodyWrap));
                }
            }

            var conncheck = this._proto._connect_cb(bodyWrap);
            if (conncheck === Strophe.Status.CONNFAIL) {
                return;
            }

            this._authentication.sasl_scram_sha1 = false;
            this._authentication.sasl_plain = false;
            this._authentication.sasl_digest_md5 = false;
            this._authentication.sasl_anonymous = false;

            this._authentication.legacy_auth = false;

            // Check for the stream:features tag
            var hasFeatures = bodyWrap.getElementsByTagName("stream:features").length > 0;
            if (!hasFeatures) {
                hasFeatures = bodyWrap.getElementsByTagName("features").length > 0;
            }
            var mechanisms = bodyWrap.getElementsByTagName("mechanism");
            var matched = [];
            var i, mech, auth_str, hashed_auth_str,
                found_authentication = false;
            if (!hasFeatures) {
                this._proto._no_auth_received(_callback);
                return;
            }
            if (mechanisms.length > 0) {
                for (i = 0; i < mechanisms.length; i++) {
                    mech = Strophe.getText(mechanisms[i]);
                    if (this.mechanisms[mech]) matched.push(this.mechanisms[mech]);
                }
            }
            this._authentication.legacy_auth =
                bodyWrap.getElementsByTagName("auth").length > 0;
            found_authentication = this._authentication.legacy_auth ||
                matched.length > 0;
            if (!found_authentication) {
                this._proto._no_auth_received(_callback);
                return;
            }
            if (this.do_authentication !== false)
                this.authenticate(matched);
        },

        /** Function: authenticate
         * Set up authentication
         *
         *  Contiunues the initial connection request by setting up authentication
         *  handlers and start the authentication process.
         *
         *  SASL authentication will be attempted if available, otherwise
         *  the code will fall back to legacy authentication.
         *
         */
        authenticate: function (matched) {
            var i;
            // Sorting matched mechanisms according to priority.
            for (i = 0; i < matched.length - 1; ++i) {
                var higher = i;
                for (var j = i + 1; j < matched.length; ++j) {
                    if (matched[j].prototype.priority > matched[higher].prototype.priority) {
                        higher = j;
                    }
                }
                if (higher != i) {
                    var swap = matched[i];
                    matched[i] = matched[higher];
                    matched[higher] = swap;
                }
            }

            // run each mechanism
            var mechanism_found = false;
            for (i = 0; i < matched.length; ++i) {
                if (!matched[i].test(this)) continue;

                this._sasl_success_handler = this._addSysHandler(
                    this._sasl_success_cb.bind(this), null,
                    "success", null, null);
                this._sasl_failure_handler = this._addSysHandler(
                    this._sasl_failure_cb.bind(this), null,
                    "failure", null, null);
                this._sasl_challenge_handler = this._addSysHandler(
                    this._sasl_challenge_cb.bind(this), null,
                    "challenge", null, null);

                this._sasl_mechanism = new matched[i]();
                this._sasl_mechanism.onStart(this);

                var request_auth_exchange = $build("auth", {
                    xmlns: Strophe.NS.SASL,
                    mechanism: this._sasl_mechanism.name
                });

                if (this._sasl_mechanism.isClientFirst) {
                    var response = this._sasl_mechanism.onChallenge(this, null);
                    request_auth_exchange.t(Base64.encode(response));
                }

                this.send(request_auth_exchange.tree());

                mechanism_found = true;
                break;
            }

            if (!mechanism_found) {
                // if none of the mechanism worked
                if (Strophe.getNodeFromJid(this.jid) === null) {
                    // we don't have a node, which is required for non-anonymous
                    // client connections
                    this._changeConnectStatus(Strophe.Status.CONNFAIL,
                        'x-strophe-bad-non-anon-jid');
                    this.disconnect('x-strophe-bad-non-anon-jid');
                } else {
                    // fall back to legacy authentication
                    this._changeConnectStatus(Strophe.Status.AUTHENTICATING, null);
                    this._addSysHandler(this._auth1_cb.bind(this), null, null,
                        null, "_auth_1");

                    this.send($iq({
                        type: "get",
                        to: this.domain,
                        id: "_auth_1"
                    }).c("query", {
                            xmlns: Strophe.NS.AUTH
                        }).c("username", {}).t(Strophe.getNodeFromJid(this.jid)).tree());
                }
            }

        },

        _sasl_challenge_cb: function (elem) {
            var challenge = Base64.decode(Strophe.getText(elem));
            var response = this._sasl_mechanism.onChallenge(this, challenge);

            var stanza = $build('response', {
                xmlns: Strophe.NS.SASL
            });
            if (response !== "") {
                stanza.t(Base64.encode(response));
            }
            this.send(stanza.tree());

            return true;
        },

        /** PrivateFunction: _auth1_cb
         *  _Private_ handler for legacy authentication.
         *
         *  This handler is called in response to the initial <iq type='get'/>
         *  for legacy authentication.  It builds an authentication <iq/> and
         *  sends it, creating a handler (calling back to _auth2_cb()) to
         *  handle the result
         *
         *  Parameters:
         *    (XMLElement) elem - The stanza that triggered the callback.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _auth1_cb: function (elem) {
            // build plaintext auth iq
            var iq = $iq({type: "set", id: "_auth_2"})
                .c('query', {xmlns: Strophe.NS.AUTH})
                .c('username', {}).t(Strophe.getNodeFromJid(this.jid))
                .up()
                .c('password').t(this.pass);

            if (!Strophe.getResourceFromJid(this.jid)) {
                // since the user has not supplied a resource, we pick
                // a default one here.  unlike other auth methods, the server
                // cannot do this for us.
                this.jid = Strophe.getBareJidFromJid(this.jid) + '/strophe';
            }
            iq.up().c('resource', {}).t(Strophe.getResourceFromJid(this.jid));

            this._addSysHandler(this._auth2_cb.bind(this), null,
                null, null, "_auth_2");

            this.send(iq.tree());

            return false;
        },

        /** PrivateFunction: _sasl_success_cb
         *  _Private_ handler for succesful SASL authentication.
         *
         *  Parameters:
         *    (XMLElement) elem - The matching stanza.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _sasl_success_cb: function (elem) {
            if (this._sasl_data["server-signature"]) {
                var serverSignature;
                var success = Base64.decode(Strophe.getText(elem));
                var attribMatch = /([a-z]+)=([^,]+)(,|$)/;
                matches = success.match(attribMatch);
                if (matches[1] == "v") {
                    serverSignature = matches[2];
                }

                if (serverSignature != this._sasl_data["server-signature"]) {
                    // remove old handlers
                    this.deleteHandler(this._sasl_failure_handler);
                    this._sasl_failure_handler = null;
                    if (this._sasl_challenge_handler) {
                        this.deleteHandler(this._sasl_challenge_handler);
                        this._sasl_challenge_handler = null;
                    }

                    this._sasl_data = {};
                    return this._sasl_failure_cb(null);
                }
            }

            Strophe.info("SASL authentication succeeded.");

            if (this._sasl_mechanism)
                this._sasl_mechanism.onSuccess();

            // remove old handlers
            this.deleteHandler(this._sasl_failure_handler);
            this._sasl_failure_handler = null;
            if (this._sasl_challenge_handler) {
                this.deleteHandler(this._sasl_challenge_handler);
                this._sasl_challenge_handler = null;
            }

            this._addSysHandler(this._sasl_auth1_cb.bind(this), null,
                "stream:features", null, null);

            // we must send an xmpp:restart now
            this._sendRestart();

            return false;
        },

        /** PrivateFunction: _sasl_auth1_cb
         *  _Private_ handler to start stream binding.
         *
         *  Parameters:
         *    (XMLElement) elem - The matching stanza.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _sasl_auth1_cb: function (elem) {
            // save stream:features for future usage
            this.features = elem;

            var i, child;

            for (i = 0; i < elem.childNodes.length; i++) {
                child = elem.childNodes[i];
                if (child.nodeName == 'bind') {
                    this.do_bind = true;
                }

                if (child.nodeName == 'session') {
                    this.do_session = true;
                }
            }

            if (!this.do_bind) {
                this._changeConnectStatus(Strophe.Status.AUTHFAIL, null);
                return false;
            } else {
                this._addSysHandler(this._sasl_bind_cb.bind(this), null, null,
                    null, "_bind_auth_2");

                var resource = Strophe.getResourceFromJid(this.jid);
                if (resource) {
                    this.send($iq({type: "set", id: "_bind_auth_2"})
                        .c('bind', {xmlns: Strophe.NS.BIND})
                        .c('resource', {}).t(resource).tree());
                } else {
                    this.send($iq({type: "set", id: "_bind_auth_2"})
                        .c('bind', {xmlns: Strophe.NS.BIND})
                        .tree());
                }
            }

            return false;
        },

        /** PrivateFunction: _sasl_bind_cb
         *  _Private_ handler for binding result and session start.
         *
         *  Parameters:
         *    (XMLElement) elem - The matching stanza.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _sasl_bind_cb: function (elem) {
            if (elem.getAttribute("type") == "error") {
                Strophe.info("SASL binding failed.");
                var conflict = elem.getElementsByTagName("conflict"), condition;
                if (conflict.length > 0) {
                    condition = 'conflict';
                }
                this._changeConnectStatus(Strophe.Status.AUTHFAIL, condition);
                return false;
            }

            // TODO - need to grab errors
            var bind = elem.getElementsByTagName("bind");
            var jidNode;
            if (bind.length > 0) {
                // Grab jid
                jidNode = bind[0].getElementsByTagName("jid");
                if (jidNode.length > 0) {
                    this.jid = Strophe.getText(jidNode[0]);

                    if (this.do_session) {
                        this._addSysHandler(this._sasl_session_cb.bind(this),
                            null, null, null, "_session_auth_2");

                        this.send($iq({type: "set", id: "_session_auth_2"})
                            .c('session', {xmlns: Strophe.NS.SESSION})
                            .tree());
                    } else {
                        this.authenticated = true;
                        this._changeConnectStatus(Strophe.Status.CONNECTED, null);
                    }
                }
            } else {
                Strophe.info("SASL binding failed.");
                this._changeConnectStatus(Strophe.Status.AUTHFAIL, null);
                return false;
            }
        },

        /** PrivateFunction: _sasl_session_cb
         *  _Private_ handler to finish successful SASL connection.
         *
         *  This sets Connection.authenticated to true on success, which
         *  starts the processing of user handlers.
         *
         *  Parameters:
         *    (XMLElement) elem - The matching stanza.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _sasl_session_cb: function (elem) {
            if (elem.getAttribute("type") == "result") {
                this.authenticated = true;
                this._changeConnectStatus(Strophe.Status.CONNECTED, null);
            } else if (elem.getAttribute("type") == "error") {
                Strophe.info("Session creation failed.");
                this._changeConnectStatus(Strophe.Status.AUTHFAIL, null);
                return false;
            }

            return false;
        },

        /** PrivateFunction: _sasl_failure_cb
         *  _Private_ handler for SASL authentication failure.
         *
         *  Parameters:
         *    (XMLElement) elem - The matching stanza.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _sasl_failure_cb: function (elem) {
            // delete unneeded handlers
            if (this._sasl_success_handler) {
                this.deleteHandler(this._sasl_success_handler);
                this._sasl_success_handler = null;
            }
            if (this._sasl_challenge_handler) {
                this.deleteHandler(this._sasl_challenge_handler);
                this._sasl_challenge_handler = null;
            }

            if (this._sasl_mechanism)
                this._sasl_mechanism.onFailure();
            this._changeConnectStatus(Strophe.Status.AUTHFAIL, null);
            return false;
        },

        /** PrivateFunction: _auth2_cb
         *  _Private_ handler to finish legacy authentication.
         *
         *  This handler is called when the result from the jabber:iq:auth
         *  <iq/> stanza is returned.
         *
         *  Parameters:
         *    (XMLElement) elem - The stanza that triggered the callback.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _auth2_cb: function (elem) {
            if (elem.getAttribute("type") == "result") {
                this.authenticated = true;
                this._changeConnectStatus(Strophe.Status.CONNECTED, null);
            } else if (elem.getAttribute("type") == "error") {
                this._changeConnectStatus(Strophe.Status.AUTHFAIL, null);
                this.disconnect('authentication failed');
            }

            return false;
        },

        /** PrivateFunction: _addSysTimedHandler
         *  _Private_ function to add a system level timed handler.
         *
         *  This function is used to add a Strophe.TimedHandler for the
         *  library code.  System timed handlers are allowed to run before
         *  authentication is complete.
         *
         *  Parameters:
         *    (Integer) period - The period of the handler.
         *    (Function) handler - The callback function.
         */
        _addSysTimedHandler: function (period, handler) {
            var thand = new Strophe.TimedHandler(period, handler);
            thand.user = false;
            this.addTimeds.push(thand);
            return thand;
        },

        /** PrivateFunction: _addSysHandler
         *  _Private_ function to add a system level stanza handler.
         *
         *  This function is used to add a Strophe.Handler for the
         *  library code.  System stanza handlers are allowed to run before
         *  authentication is complete.
         *
         *  Parameters:
         *    (Function) handler - The callback function.
         *    (String) ns - The namespace to match.
         *    (String) name - The stanza name to match.
         *    (String) type - The stanza type attribute to match.
         *    (String) id - The stanza id attribute to match.
         */
        _addSysHandler: function (handler, ns, name, type, id) {
            var hand = new Strophe.Handler(handler, ns, name, type, id);
            hand.user = false;
            this.addHandlers.push(hand);
            return hand;
        },

        /** PrivateFunction: _onDisconnectTimeout
         *  _Private_ timeout handler for handling non-graceful disconnection.
         *
         *  If the graceful disconnect process does not complete within the
         *  time allotted, this handler finishes the disconnect anyway.
         *
         *  Returns:
         *    false to remove the handler.
         */
        _onDisconnectTimeout: function () {
            Strophe.info("_onDisconnectTimeout was called");

            this._proto._onDisconnectTimeout();

            // actually disconnect
            this._doDisconnect();

            return false;
        },

        /** PrivateFunction: _onIdle
         *  _Private_ handler to process events during idle cycle.
         *
         *  This handler is called every 100ms to fire timed handlers that
         *  are ready and keep poll requests going.
         */
        _onIdle: function () {
            var i, thand, since, newList;

            // add timed handlers scheduled for addition
            // NOTE: we add before remove in the case a timed handler is
            // added and then deleted before the next _onIdle() call.
            while (this.addTimeds.length > 0) {
                this.timedHandlers.push(this.addTimeds.pop());
            }

            // remove timed handlers that have been scheduled for deletion
            while (this.removeTimeds.length > 0) {
                thand = this.removeTimeds.pop();
                i = this.timedHandlers.indexOf(thand);
                if (i >= 0) {
                    this.timedHandlers.splice(i, 1);
                }
            }

            // call ready timed handlers
            var now = new Date().getTime();
            newList = [];
            for (i = 0; i < this.timedHandlers.length; i++) {
                thand = this.timedHandlers[i];
                if (this.authenticated || !thand.user) {
                    since = thand.lastCalled + thand.period;
                    if (since - now <= 0) {
                        if (thand.run()) {
                            newList.push(thand);
                        }
                    } else {
                        newList.push(thand);
                    }
                }
            }
            this.timedHandlers = newList;

            var body, time_elapsed;

            clearTimeout(this._idleTimeout);

            this._proto._onIdle();

            // reactivate the timer only if connected
            if (this.connected) {
                this._idleTimeout = setTimeout(this._onIdle.bind(this), 100);
            }
        }
    };

    if (callback) {
        callback(Strophe, $build, $msg, $iq, $pres);
    }

    /** Class: Strophe.SASLMechanism
     *
     *  encapsulates SASL authentication mechanisms.
     *
     *  User code may override the priority for each mechanism or disable it completely.
     *  See <priority> for information about changing priority and <test> for informatian on
     *  how to disable a mechanism.
     *
     *  By default, all mechanisms are enabled and the priorities are
     *
     *  SCRAM-SHA1 - 40
     *  DIGEST-MD5 - 30
     *  Plain - 20
     */

    /**
     * PrivateConstructor: Strophe.SASLMechanism
     * SASL auth mechanism abstraction.
     *
     *  Parameters:
     *    (String) name - SASL Mechanism name.
     *    (Boolean) isClientFirst - If client should send response first without challenge.
     *    (Number) priority - Priority.
     *
     *  Returns:
     *    A new Strophe.SASLMechanism object.
     */
    Strophe.SASLMechanism = function (name, isClientFirst, priority) {
        /** PrivateVariable: name
         *  Mechanism name.
         */
        this.name = name;
        /** PrivateVariable: isClientFirst
         *  If client sends response without initial server challenge.
         */
        this.isClientFirst = isClientFirst;
        /** Variable: priority
         *  Determines which <SASLMechanism> is chosen for authentication (Higher is better).
         *  Users may override this to prioritize mechanisms differently.
         *
         *  In the default configuration the priorities are
         *
         *  SCRAM-SHA1 - 40
         *  DIGEST-MD5 - 30
         *  Plain - 20
         *
         *  Example: (This will cause Strophe to choose the mechanism that the server sent first)
         *
         *  > Strophe.SASLMD5.priority = Strophe.SASLSHA1.priority;
         *
         *  See <SASL mechanisms> for a list of available mechanisms.
         *
         */
        this.priority = priority;
    };

    Strophe.SASLMechanism.prototype = {
        _sasl_data: {},

        /**
         *  Function: test
         *  Checks if mechanism able to run.
         *  To disable a mechanism, make this return false;
         *
         *  To disable plain authentication run
         *  > Strophe.SASLPlain.test = function() {
   *  >   return false;
   *  > }
         *
         *  See <SASL mechanisms> for a list of available mechanisms.
         *
         *  Parameters:
         *    (Strophe.Connection) connection - Target Connection.
         *
         *  Returns:
         *    (Boolean) If mechanism was able to run.
         */
        test: function (connection) {
            return true;
        },

        /** PrivateFunction: onStart
         *  Called before starting mechanism on some connection.
         *
         *  Parameters:
         *    (Strophe.Connection) connection - Target Connection.
         */
        onStart: function (connection) {
            this._connection = connection;
        },

        /** PrivateFunction: onChallenge
         *  Called by protocol implementation on incoming challenge. If client is
         *  first (isClientFirst == true) challenge will be null on the first call.
         *
         *  Parameters:
         *    (Strophe.Connection) connection - Target Connection.
         *    (String) challenge - current challenge to handle.
         *
         *  Returns:
         *    (String) Mechanism response.
         */
        onChallenge: function (connection, challenge) {
            throw new Error("You should implement challenge handling!");
        },

        /** PrivateFunction: onFailure
         *  Protocol informs mechanism implementation about SASL failure.
         */
        onFailure: function () {
            this._connection = null;
        },

        /** PrivateFunction: onSuccess
         *  Protocol informs mechanism implementation about SASL success.
         */
        onSuccess: function () {
            this._connection = null;
        }
    };

    /** Constants: SASL mechanisms
     *  Available authentication mechanisms
     *
     *  Strophe.SASLAnonymous - SASL Anonymous authentication.
     *  Strophe.SASLPlain - SASL Plain authentication.
     *  Strophe.SASLMD5 - SASL Digest-MD5 authentication
     *  Strophe.SASLSHA1 - SASL SCRAM-SHA1 authentication
     */

// Building SASL callbacks

    /** PrivateConstructor: SASLAnonymous
     *  SASL Anonymous authentication.
     */
    Strophe.SASLAnonymous = function () {
    };

    Strophe.SASLAnonymous.prototype = new Strophe.SASLMechanism("ANONYMOUS", false, 10);

    Strophe.SASLAnonymous.test = function (connection) {
        return connection.authcid === null;
    };

    Strophe.Connection.prototype.mechanisms[Strophe.SASLAnonymous.prototype.name] = Strophe.SASLAnonymous;

    /** PrivateConstructor: SASLPlain
     *  SASL Plain authentication.
     */
    Strophe.SASLPlain = function () {
    };

    Strophe.SASLPlain.prototype = new Strophe.SASLMechanism("PLAIN", true, 20);

    Strophe.SASLPlain.test = function (connection) {
        return connection.authcid !== null;
    };

    Strophe.SASLPlain.prototype.onChallenge = function (connection, challenge) {
        var auth_str = connection.authzid;
        auth_str = auth_str + "\u0000";
        auth_str = auth_str + connection.authcid;
        auth_str = auth_str + "\u0000";
        auth_str = auth_str + connection.pass;
        return auth_str;
    };

    Strophe.Connection.prototype.mechanisms[Strophe.SASLPlain.prototype.name] = Strophe.SASLPlain;

    /** PrivateConstructor: SASLSHA1
     *  SASL SCRAM SHA 1 authentication.
     */
    Strophe.SASLSHA1 = function () {
    };

    /* TEST:
     * This is a simple example of a SCRAM-SHA-1 authentication exchange
     * when the client doesn't support channel bindings (username 'user' and
     * password 'pencil' are used):
     *
     * C: n,,n=user,r=fyko+d2lbbFgONRv9qkxdawL
     * S: r=fyko+d2lbbFgONRv9qkxdawL3rfcNHYJY1ZVvWVs7j,s=QSXCR+Q6sek8bf92,
     * i=4096
     * C: c=biws,r=fyko+d2lbbFgONRv9qkxdawL3rfcNHYJY1ZVvWVs7j,
     * p=v0X8v3Bz2T0CJGbJQyF0X+HI4Ts=
     * S: v=rmF9pqV8S7suAoZWja4dJRkFsKQ=
     *
     */

    Strophe.SASLSHA1.prototype = new Strophe.SASLMechanism("SCRAM-SHA-1", true, 40);

    Strophe.SASLSHA1.test = function (connection) {
        return connection.authcid !== null;
    };

    Strophe.SASLSHA1.prototype.onChallenge = function (connection, challenge, test_cnonce) {
        var cnonce = test_cnonce || MD5.hexdigest(Math.random() * 1234567890);

        var auth_str = "n=" + connection.authcid;
        auth_str += ",r=";
        auth_str += cnonce;

        this._sasl_data.cnonce = cnonce;
        this._sasl_data["client-first-message-bare"] = auth_str;

        auth_str = "n,," + auth_str;

        this.onChallenge = function (connection, challenge) {
            var nonce, salt, iter, Hi, U, U_old;
            var clientKey, serverKey, clientSignature;
            var responseText = "c=biws,";
            var authMessage = this._sasl_data["client-first-message-bare"] + "," +
                challenge + ",";
            var cnonce = this._sasl_data.cnonce;
            var attribMatch = /([a-z]+)=([^,]+)(,|$)/;

            while (challenge.match(attribMatch)) {
                matches = challenge.match(attribMatch);
                challenge = challenge.replace(matches[0], "");
                switch (matches[1]) {
                    case "r":
                        nonce = matches[2];
                        break;
                    case "s":
                        salt = matches[2];
                        break;
                    case "i":
                        iter = matches[2];
                        break;
                }
            }

            if (nonce.substr(0, cnonce.length) !== cnonce) {
                this._sasl_data = {};
                return connection._sasl_failure_cb();
            }

            responseText += "r=" + nonce;
            authMessage += responseText;

            salt = Base64.decode(salt);
            salt += "\x00\x00\x00\x01";

            Hi = U_old = core_hmac_sha1(connection.pass, salt);
            for (i = 1; i < iter; i++) {
                U = core_hmac_sha1(connection.pass, binb2str(U_old));
                for (k = 0; k < 5; k++) {
                    Hi[k] ^= U[k];
                }
                U_old = U;
            }
            Hi = binb2str(Hi);

            clientKey = core_hmac_sha1(Hi, "Client Key");
            serverKey = str_hmac_sha1(Hi, "Server Key");
            clientSignature = core_hmac_sha1(str_sha1(binb2str(clientKey)), authMessage);
            connection._sasl_data["server-signature"] = b64_hmac_sha1(serverKey, authMessage);

            for (k = 0; k < 5; k++) {
                clientKey[k] ^= clientSignature[k];
            }

            responseText += ",p=" + Base64.encode(binb2str(clientKey));

            return responseText;
        }.bind(this);

        return auth_str;
    };

    Strophe.Connection.prototype.mechanisms[Strophe.SASLSHA1.prototype.name] = Strophe.SASLSHA1;

    /** PrivateConstructor: SASLMD5
     *  SASL DIGEST MD5 authentication.
     */
    Strophe.SASLMD5 = function () {
    };

    Strophe.SASLMD5.prototype = new Strophe.SASLMechanism("DIGEST-MD5", false, 30);

    Strophe.SASLMD5.test = function (connection) {
        return connection.authcid !== null;
    };

    /** PrivateFunction: _quote
     *  _Private_ utility function to backslash escape and quote strings.
     *
     *  Parameters:
     *    (String) str - The string to be quoted.
     *
     *  Returns:
     *    quoted string
     */
    Strophe.SASLMD5.prototype._quote = function (str) {
        return '"' + str.replace(/\\/g, "\\\\").replace(/"/g, '\\"') + '"';
        //" end string workaround for emacs
    };


    Strophe.SASLMD5.prototype.onChallenge = function (connection, challenge, test_cnonce) {
        var attribMatch = /([a-z]+)=("[^"]+"|[^,"]+)(?:,|$)/;
        var cnonce = test_cnonce || MD5.hexdigest("" + (Math.random() * 1234567890));
        var realm = "";
        var host = null;
        var nonce = "";
        var qop = "";
        var matches;

        while (challenge.match(attribMatch)) {
            matches = challenge.match(attribMatch);
            challenge = challenge.replace(matches[0], "");
            matches[2] = matches[2].replace(/^"(.+)"$/, "$1");
            switch (matches[1]) {
                case "realm":
                    realm = matches[2];
                    break;
                case "nonce":
                    nonce = matches[2];
                    break;
                case "qop":
                    qop = matches[2];
                    break;
                case "host":
                    host = matches[2];
                    break;
            }
        }

        var digest_uri = connection.servtype + "/" + connection.domain;
        if (host !== null) {
            digest_uri = digest_uri + "/" + host;
        }

        var A1 = MD5.hash(connection.authcid +
            ":" + realm + ":" + this._connection.pass) +
            ":" + nonce + ":" + cnonce;
        var A2 = 'AUTHENTICATE:' + digest_uri;

        var responseText = "";
        responseText += 'charset=utf-8,';
        responseText += 'username=' +
            this._quote(connection.authcid) + ',';
        responseText += 'realm=' + this._quote(realm) + ',';
        responseText += 'nonce=' + this._quote(nonce) + ',';
        responseText += 'nc=00000001,';
        responseText += 'cnonce=' + this._quote(cnonce) + ',';
        responseText += 'digest-uri=' + this._quote(digest_uri) + ',';
        responseText += 'response=' + MD5.hexdigest(MD5.hexdigest(A1) + ":" +
            nonce + ":00000001:" +
            cnonce + ":auth:" +
            MD5.hexdigest(A2)) + ",";
        responseText += 'qop=auth';

        this.onChallenge = function (connection, challenge) {
            return "";
        }.bind(this);

        return responseText;
    };

    Strophe.Connection.prototype.mechanisms[Strophe.SASLMD5.prototype.name] = Strophe.SASLMD5;

})(function () {
    window.Strophe = arguments[0];
    window.$build = arguments[1];
    window.$msg = arguments[2];
    window.$iq = arguments[3];
    window.$pres = arguments[4];
});
/*
 This program is distributed under the terms of the MIT license.
 Please see the LICENSE file for details.

 Copyright 2006-2008, OGG, LLC
 */

/*global document, window, setTimeout, clearTimeout, console,
 XMLHttpRequest, ActiveXObject,
 Base64, MD5,
 Strophe, $build, $msg, $iq, $pres */


/** PrivateClass: Strophe.Request
 *  _Private_ helper class that provides a cross implementation abstraction
 *  for a BOSH related XMLHttpRequest.
 *
 *  The Strophe.Request class is used internally to encapsulate BOSH request
 *  information.  It is not meant to be used from user's code.
 */

/** PrivateConstructor: Strophe.Request
 *  Create and initialize a new Strophe.Request object.
 *
 *  Parameters:
 *    (XMLElement) elem - The XML data to be sent in the request.
 *    (Function) func - The function that will be called when the
 *      XMLHttpRequest readyState changes.
 *    (Integer) rid - The BOSH rid attribute associated with this request.
 *    (Integer) sends - The number of times this same request has been
 *      sent.
 */
Strophe.Request = function (elem, func, rid, sends) {
    this.id = ++Strophe._requestId;
    this.xmlData = elem;
    this.data = Strophe.serialize(elem);
    // save original function in case we need to make a new request
    // from this one.
    this.origFunc = func;
    this.func = func;
    this.rid = rid;
    this.date = NaN;
    this.sends = sends || 0;
    this.abort = false;
    this.dead = null;

    this.age = function () {
        if (!this.date) {
            return 0;
        }
        var now = new Date();
        return (now - this.date) / 1000;
    };
    this.timeDead = function () {
        if (!this.dead) {
            return 0;
        }
        var now = new Date();
        return (now - this.dead) / 1000;
    };
    this.xhr = this._newXHR();
};

Strophe.Request.prototype = {
    /** PrivateFunction: getResponse
     *  Get a response from the underlying XMLHttpRequest.
     *
     *  This function attempts to get a response from the request and checks
     *  for errors.
     *
     *  Throws:
     *    "parsererror" - A parser error occured.
     *
     *  Returns:
     *    The DOM element tree of the response.
     */
    getResponse: function () {
        var node = null;
        if (this.xhr.responseXML && this.xhr.responseXML.documentElement) {
            node = this.xhr.responseXML.documentElement;
            if (node.tagName == "parsererror") {
                Strophe.error("invalid response received");
                Strophe.error("responseText: " + this.xhr.responseText);
                Strophe.error("responseXML: " +
                    Strophe.serialize(this.xhr.responseXML));
                throw "parsererror";
            }
        } else if (this.xhr.responseText) {
            Strophe.error("invalid response received");
            Strophe.error("responseText: " + this.xhr.responseText);
            Strophe.error("responseXML: " +
                Strophe.serialize(this.xhr.responseXML));
        }

        return node;
    },

    /** PrivateFunction: _newXHR
     *  _Private_ helper function to create XMLHttpRequests.
     *
     *  This function creates XMLHttpRequests across all implementations.
     *
     *  Returns:
     *    A new XMLHttpRequest.
     */
    _newXHR: function () {
        var xhr = null;
        if (window.XMLHttpRequest) {
            xhr = new XMLHttpRequest();
            if (xhr.overrideMimeType) {
                xhr.overrideMimeType("text/xml");
            }
        } else if (window.ActiveXObject) {
            xhr = new ActiveXObject("Microsoft.XMLHTTP");
        }

        // use Function.bind() to prepend ourselves as an argument
        xhr.onreadystatechange = this.func.bind(null, this);

        return xhr;
    }
};

/** Class: Strophe.Bosh
 *  _Private_ helper class that handles BOSH Connections
 *
 *  The Strophe.Bosh class is used internally by Strophe.Connection
 *  to encapsulate BOSH sessions. It is not meant to be used from user's code.
 */

/** File: bosh.js
 *  A JavaScript library to enable BOSH in Strophejs.
 *
 *  this library uses Bidirectional-streams Over Synchronous HTTP (BOSH)
 *  to emulate a persistent, stateful, two-way connection to an XMPP server.
 *  More information on BOSH can be found in XEP 124.
 */

/** PrivateConstructor: Strophe.Bosh
 *  Create and initialize a Strophe.Bosh object.
 *
 *  Parameters:
 *    (Strophe.Connection) connection - The Strophe.Connection that will use BOSH.
 *
 *  Returns:
 *    A new Strophe.Bosh object.
 */
Strophe.Bosh = function (connection) {
    this._conn = connection;
    /* request id for body tags */
    this.rid = Math.floor(Math.random() * 4294967295);
    /* The current session ID. */
    this.sid = null;

    // default BOSH values
    this.hold = 1;
    this.wait = 60;
    this.window = 5;

    this._requests = [];
};

Strophe.Bosh.prototype = {
    /** Variable: strip
     *
     *  BOSH-Connections will have all stanzas wrapped in a <body> tag when
     *  passed to <Strophe.Connection.xmlInput> or <Strophe.Connection.xmlOutput>.
     *  To strip this tag, User code can set <Strophe.Bosh.strip> to "body":
     *
     *  > Strophe.Bosh.prototype.strip = "body";
     *
     *  This will enable stripping of the body tag in both
     *  <Strophe.Connection.xmlInput> and <Strophe.Connection.xmlOutput>.
     */
    strip: null,

    /** PrivateFunction: _buildBody
     *  _Private_ helper function to generate the <body/> wrapper for BOSH.
     *
     *  Returns:
     *    A Strophe.Builder with a <body/> element.
     */
    _buildBody: function () {
        var bodyWrap = $build('body', {
            rid: this.rid++,
            xmlns: Strophe.NS.HTTPBIND
        });

        if (this.sid !== null) {
            bodyWrap.attrs({sid: this.sid});
        }

        return bodyWrap;
    },

    /** PrivateFunction: _reset
     *  Reset the connection.
     *
     *  This function is called by the reset function of the Strophe Connection
     */
    _reset: function () {
        this.rid = Math.floor(Math.random() * 4294967295);
        this.sid = null;
    },

    /** PrivateFunction: _connect
     *  _Private_ function that initializes the BOSH connection.
     *
     *  Creates and sends the Request that initializes the BOSH connection.
     */
    _connect: function (wait, hold, route) {
        this.wait = wait || this.wait;
        this.hold = hold || this.hold;

        // build the body tag
        var body = this._buildBody().attrs({
            to: this._conn.domain,
            "xml:lang": "en",
            wait: this.wait,
            hold: this.hold,
            content: "text/xml; charset=utf-8",
            ver: "1.6",
            "xmpp:version": "1.0",
            "xmlns:xmpp": Strophe.NS.BOSH
        });

        if (route) {
            body.attrs({
                route: route
            });
        }

        var _connect_cb = this._conn._connect_cb;

        this._requests.push(
            new Strophe.Request(body.tree(),
                this._onRequestStateChange.bind(
                    this, _connect_cb.bind(this._conn)),
                body.tree().getAttribute("rid")));
        this._throttledRequestHandler();
    },

    /** PrivateFunction: _attach
     *  Attach to an already created and authenticated BOSH session.
     *
     *  This function is provided to allow Strophe to attach to BOSH
     *  sessions which have been created externally, perhaps by a Web
     *  application.  This is often used to support auto-login type features
     *  without putting user credentials into the page.
     *
     *  Parameters:
     *    (String) jid - The full JID that is bound by the session.
     *    (String) sid - The SID of the BOSH session.
     *    (String) rid - The current RID of the BOSH session.  This RID
     *      will be used by the next request.
     *    (Function) callback The connect callback function.
     *    (Integer) wait - The optional HTTPBIND wait value.  This is the
     *      time the server will wait before returning an empty result for
     *      a request.  The default setting of 60 seconds is recommended.
     *      Other settings will require tweaks to the Strophe.TIMEOUT value.
     *    (Integer) hold - The optional HTTPBIND hold value.  This is the
     *      number of connections the server will hold at one time.  This
     *      should almost always be set to 1 (the default).
     *    (Integer) wind - The optional HTTBIND window value.  This is the
     *      allowed range of request ids that are valid.  The default is 5.
     */
    _attach: function (jid, sid, rid, callback, wait, hold, wind) {
        this._conn.jid = jid;
        this.sid = sid;
        this.rid = rid;

        this._conn.connect_callback = callback;

        this._conn.domain = Strophe.getDomainFromJid(this._conn.jid);

        this._conn.authenticated = true;
        this._conn.connected = true;

        this.wait = wait || this.wait;
        this.hold = hold || this.hold;
        this.window = wind || this.window;

        this._conn._changeConnectStatus(Strophe.Status.ATTACHED, null);
    },

    /** PrivateFunction: _connect_cb
     *  _Private_ handler for initial connection request.
     *
     *  This handler is used to process the Bosh-part of the initial request.
     *  Parameters:
     *    (Strophe.Request) bodyWrap - The received stanza.
     */
    _connect_cb: function (bodyWrap) {
        var typ = bodyWrap.getAttribute("type");
        var cond, conflict;
        if (typ !== null && typ == "terminate") {
            // an error occurred
            Strophe.error("BOSH-Connection failed: " + cond);
            cond = bodyWrap.getAttribute("condition");
            conflict = bodyWrap.getElementsByTagName("conflict");
            if (cond !== null) {
                if (cond == "remote-stream-error" && conflict.length > 0) {
                    cond = "conflict";
                }
                this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, cond);
            } else {
                this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, "unknown");
            }
            this._conn._doDisconnect();
            return Strophe.Status.CONNFAIL;
        }

        // check to make sure we don't overwrite these if _connect_cb is
        // called multiple times in the case of missing stream:features
        if (!this.sid) {
            this.sid = bodyWrap.getAttribute("sid");
        }
        var wind = bodyWrap.getAttribute('requests');
        if (wind) {
            this.window = parseInt(wind, 10);
        }
        var hold = bodyWrap.getAttribute('hold');
        if (hold) {
            this.hold = parseInt(hold, 10);
        }
        var wait = bodyWrap.getAttribute('wait');
        if (wait) {
            this.wait = parseInt(wait, 10);
        }
    },

    /** PrivateFunction: _disconnect
     *  _Private_ part of Connection.disconnect for Bosh
     *
     *  Parameters:
     *    (Request) pres - This stanza will be sent before disconnecting.
     */
    _disconnect: function (pres) {
        this._sendTerminate(pres);
    },

    /** PrivateFunction: _doDisconnect
     *  _Private_ function to disconnect.
     *
     *  Resets the SID and RID.
     */
    _doDisconnect: function () {
        this.sid = null;
        this.rid = Math.floor(Math.random() * 4294967295);
    },

    /** PrivateFunction: _emptyQueue
     * _Private_ function to check if the Request queue is empty.
     *
     *  Returns:
     *    True, if there are no Requests queued, False otherwise.
     */
    _emptyQueue: function () {
        return this._requests.length === 0;
    },

    /** PrivateFunction: _hitError
     *  _Private_ function to handle the error count.
     *
     *  Requests are resent automatically until their error count reaches
     *  5.  Each time an error is encountered, this function is called to
     *  increment the count and disconnect if the count is too high.
     *
     *  Parameters:
     *    (Integer) reqStatus - The request status.
     */
    _hitError: function (reqStatus) {
        this.errors++;
        Strophe.warn("request errored, status: " + reqStatus +
            ", number of errors: " + this.errors);
        if (this.errors > 4) {
            this._onDisconnectTimeout();
        }
    },

    /** PrivateFunction: _no_auth_received
     *
     * Called on stream start/restart when no stream:features
     * has been received and sends a blank poll request.
     */
    _no_auth_received: function (_callback) {
        if (_callback) {
            _callback = _callback.bind(this._conn);
        } else {
            _callback = this._conn._connect_cb.bind(this._conn);
        }
        var body = this._buildBody();
        this._requests.push(
            new Strophe.Request(body.tree(),
                this._onRequestStateChange.bind(
                    this, _callback.bind(this._conn)),
                body.tree().getAttribute("rid")));
        this._throttledRequestHandler();
    },

    /** PrivateFunction: _onDisconnectTimeout
     *  _Private_ timeout handler for handling non-graceful disconnection.
     *
     *  Cancels all remaining Requests and clears the queue.
     */
    _onDisconnectTimeout: function () {
        var req;
        while (this._requests.length > 0) {
            req = this._requests.pop();
            req.abort = true;
            req.xhr.abort();
            // jslint complains, but this is fine. setting to empty func
            // is necessary for IE6
            req.xhr.onreadystatechange = function () {
            };
        }
    },

    /** PrivateFunction: _onIdle
     *  _Private_ handler called by Strophe.Connection._onIdle
     *
     *  Sends all queued Requests or polls with empty Request if there are none.
     */
    _onIdle: function () {
        var data = this._conn._data;

        // if no requests are in progress, poll
        if (this._conn.authenticated && this._requests.length === 0 &&
            data.length === 0 && !this._conn.disconnecting) {
            Strophe.info("no requests during idle cycle, sending " +
                "blank request");
            data.push(null);
        }

        if (this._requests.length < 2 && data.length > 0 && !this._conn.paused) {
            body = this._buildBody();
            for (i = 0; i < data.length; i++) {
                if (data[i] !== null) {
                    if (data[i] === "restart") {
                        body.attrs({
                            to: this._conn.domain,
                            "xml:lang": "en",
                            "xmpp:restart": "true",
                            "xmlns:xmpp": Strophe.NS.BOSH
                        });
                    } else {
                        body.cnode(data[i]).up();
                    }
                }
            }
            delete this._conn._data;
            this._conn._data = [];
            this._requests.push(
                new Strophe.Request(body.tree(),
                    this._onRequestStateChange.bind(
                        this, this._conn._dataRecv.bind(this._conn)),
                    body.tree().getAttribute("rid")));
            this._processRequest(this._requests.length - 1);
        }

        if (this._requests.length > 0) {
            time_elapsed = this._requests[0].age();
            if (this._requests[0].dead !== null) {
                if (this._requests[0].timeDead() >
                    Math.floor(Strophe.SECONDARY_TIMEOUT * this.wait)) {
                    this._throttledRequestHandler();
                }
            }

            if (time_elapsed > Math.floor(Strophe.TIMEOUT * this.wait)) {
                Strophe.warn("Request " +
                    this._requests[0].id +
                    " timed out, over " + Math.floor(Strophe.TIMEOUT * this.wait) +
                    " seconds since last activity");
                this._throttledRequestHandler();
            }
        }
    },

    /** PrivateFunction: _onRequestStateChange
     *  _Private_ handler for Strophe.Request state changes.
     *
     *  This function is called when the XMLHttpRequest readyState changes.
     *  It contains a lot of error handling logic for the many ways that
     *  requests can fail, and calls the request callback when requests
     *  succeed.
     *
     *  Parameters:
     *    (Function) func - The handler for the request.
     *    (Strophe.Request) req - The request that is changing readyState.
     */
    _onRequestStateChange: function (func, req) {
        Strophe.debug("request id " + req.id +
            "." + req.sends + " state changed to " +
            req.xhr.readyState);

        if (req.abort) {
            req.abort = false;
            return;
        }

        // request complete
        var reqStatus;
        if (req.xhr.readyState == 4) {
            reqStatus = 0;
            try {
                reqStatus = req.xhr.status;
            } catch (e) {
                // ignore errors from undefined status attribute.  works
                // around a browser bug
            }

            if (typeof(reqStatus) == "undefined") {
                reqStatus = 0;
            }

            if (this.disconnecting) {
                if (reqStatus >= 400) {
                    this._hitError(reqStatus);
                    return;
                }
            }

            var reqIs0 = (this._requests[0] == req);
            var reqIs1 = (this._requests[1] == req);

            if ((reqStatus > 0 && reqStatus < 500) || req.sends > 5) {
                // remove from internal queue
                this._removeRequest(req);
                Strophe.debug("request id " +
                    req.id +
                    " should now be removed");
            }

            // request succeeded
            if (reqStatus == 200) {
                // if request 1 finished, or request 0 finished and request
                // 1 is over Strophe.SECONDARY_TIMEOUT seconds old, we need to
                // restart the other - both will be in the first spot, as the
                // completed request has been removed from the queue already
                if (reqIs1 ||
                    (reqIs0 && this._requests.length > 0 &&
                        this._requests[0].age() > Math.floor(Strophe.SECONDARY_TIMEOUT * this.wait))) {
                    this._restartRequest(0);
                }
                // call handler
                Strophe.debug("request id " +
                    req.id + "." +
                    req.sends + " got 200");
                func(req);
                this.errors = 0;
            } else {
                Strophe.error("request id " +
                    req.id + "." +
                    req.sends + " error " + reqStatus +
                    " happened");
                if (reqStatus === 0 ||
                    (reqStatus >= 400 && reqStatus < 600) ||
                    reqStatus >= 12000) {
                    this._hitError(reqStatus);
                    if (reqStatus >= 400 && reqStatus < 500) {
                        this._conn._changeConnectStatus(Strophe.Status.DISCONNECTING,
                            null);
                        this._conn._doDisconnect();
                    }
                }
            }

            if (!((reqStatus > 0 && reqStatus < 500) ||
                req.sends > 5)) {
                this._throttledRequestHandler();
            }
        }
    },

    /** PrivateFunction: _processRequest
     *  _Private_ function to process a request in the queue.
     *
     *  This function takes requests off the queue and sends them and
     *  restarts dead requests.
     *
     *  Parameters:
     *    (Integer) i - The index of the request in the queue.
     */
    _processRequest: function (i) {
        var self = this;
        var req = this._requests[i];
        var reqStatus = -1;

        try {
            if (req.xhr.readyState == 4) {
                reqStatus = req.xhr.status;
            }
        } catch (e) {
            Strophe.error("caught an error in _requests[" + i +
                "], reqStatus: " + reqStatus);
        }

        if (typeof(reqStatus) == "undefined") {
            reqStatus = -1;
        }

        // make sure we limit the number of retries
        if (req.sends > this.maxRetries) {
            this._onDisconnectTimeout();
            return;
        }

        var time_elapsed = req.age();
        var primaryTimeout = (!isNaN(time_elapsed) &&
            time_elapsed > Math.floor(Strophe.TIMEOUT * this.wait));
        var secondaryTimeout = (req.dead !== null &&
            req.timeDead() > Math.floor(Strophe.SECONDARY_TIMEOUT * this.wait));
        var requestCompletedWithServerError = (req.xhr.readyState == 4 &&
            (reqStatus < 1 ||
                reqStatus >= 500));
        if (primaryTimeout || secondaryTimeout ||
            requestCompletedWithServerError) {
            if (secondaryTimeout) {
                Strophe.error("Request " +
                    this._requests[i].id +
                    " timed out (secondary), restarting");
            }
            req.abort = true;
            req.xhr.abort();
            // setting to null fails on IE6, so set to empty function
            req.xhr.onreadystatechange = function () {
            };
            this._requests[i] = new Strophe.Request(req.xmlData,
                req.origFunc,
                req.rid,
                req.sends);
            req = this._requests[i];
        }

        if (req.xhr.readyState === 0) {
            Strophe.debug("request id " + req.id +
                "." + req.sends + " posting");

            try {
                req.xhr.open("POST", this._conn.service, true);
            } catch (e2) {
                Strophe.error("XHR open failed.");
                if (!this._conn.connected) {
                    this._conn._changeConnectStatus(Strophe.Status.CONNFAIL,
                        "bad-service");
                }
                this._conn.disconnect();
                return;
            }

            // Fires the XHR request -- may be invoked immediately
            // or on a gradually expanding retry window for reconnects
            var sendFunc = function () {
                req.date = new Date();
                if (self._conn._options.customHeaders) {
                    var headers = self._conn._options.customHeaders;
                    for (var header in headers) {
                        if (headers.hasOwnProperty(header)) {
                            req.xhr.setRequestHeader(header, headers[header]);
                        }
                    }
                }
                req.xhr.send(req.data);
            };

            // Implement progressive backoff for reconnects --
            // First retry (send == 1) should also be instantaneous
            if (req.sends > 1) {
                // Using a cube of the retry number creates a nicely
                // expanding retry window
                var backoff = Math.min(Math.floor(Strophe.TIMEOUT * this.wait),
                    Math.pow(req.sends, 3)) * 1000;
                setTimeout(sendFunc, backoff);
            } else {
                sendFunc();
            }

            req.sends++;

            if (this._conn.xmlOutput !== Strophe.Connection.prototype.xmlOutput) {
                if (req.xmlData.nodeName === this.strip && req.xmlData.childNodes.length) {
                    this._conn.xmlOutput(req.xmlData.childNodes[0]);
                } else {
                    this._conn.xmlOutput(req.xmlData);
                }
            }
            if (this._conn.rawOutput !== Strophe.Connection.prototype.rawOutput) {
                this._conn.rawOutput(req.data);
            }
        } else {
            Strophe.debug("_processRequest: " +
                (i === 0 ? "first" : "second") +
                " request has readyState of " +
                req.xhr.readyState);
        }
    },

    /** PrivateFunction: _removeRequest
     *  _Private_ function to remove a request from the queue.
     *
     *  Parameters:
     *    (Strophe.Request) req - The request to remove.
     */
    _removeRequest: function (req) {
        Strophe.debug("removing request");

        var i;
        for (i = this._requests.length - 1; i >= 0; i--) {
            if (req == this._requests[i]) {
                this._requests.splice(i, 1);
            }
        }

        // IE6 fails on setting to null, so set to empty function
        req.xhr.onreadystatechange = function () {
        };

        this._throttledRequestHandler();
    },

    /** PrivateFunction: _restartRequest
     *  _Private_ function to restart a request that is presumed dead.
     *
     *  Parameters:
     *    (Integer) i - The index of the request in the queue.
     */
    _restartRequest: function (i) {
        var req = this._requests[i];
        if (req.dead === null) {
            req.dead = new Date();
        }

        this._processRequest(i);
    },

    /** PrivateFunction: _reqToData
     * _Private_ function to get a stanza out of a request.
     *
     * Tries to extract a stanza out of a Request Object.
     * When this fails the current connection will be disconnected.
     *
     *  Parameters:
     *    (Object) req - The Request.
     *
     *  Returns:
     *    The stanza that was passed.
     */
    _reqToData: function (req) {
        try {
            return req.getResponse();
        } catch (e) {
            if (e != "parsererror") {
                throw e;
            }
            this._conn.disconnect("strophe-parsererror");
        }
    },

    /** PrivateFunction: _sendTerminate
     *  _Private_ function to send initial disconnect sequence.
     *
     *  This is the first step in a graceful disconnect.  It sends
     *  the BOSH server a terminate body and includes an unavailable
     *  presence if authentication has completed.
     */
    _sendTerminate: function (pres) {
        Strophe.info("_sendTerminate was called");
        var body = this._buildBody().attrs({type: "terminate"});

        if (pres) {
            body.cnode(pres.tree());
        }

        var req = new Strophe.Request(body.tree(),
            this._onRequestStateChange.bind(
                this, this._conn._dataRecv.bind(this._conn)),
            body.tree().getAttribute("rid"));

        this._requests.push(req);
        this._throttledRequestHandler();
    },

    /** PrivateFunction: _send
     *  _Private_ part of the Connection.send function for BOSH
     *
     * Just triggers the RequestHandler to send the messages that are in the queue
     */
    _send: function () {
        clearTimeout(this._conn._idleTimeout);
        this._throttledRequestHandler();
        this._conn._idleTimeout = setTimeout(this._conn._onIdle.bind(this._conn), 100);
    },

    /** PrivateFunction: _sendRestart
     *
     *  Send an xmpp:restart stanza.
     */
    _sendRestart: function () {
        this._throttledRequestHandler();
        clearTimeout(this._conn._idleTimeout);
    },

    /** PrivateFunction: _throttledRequestHandler
     *  _Private_ function to throttle requests to the connection window.
     *
     *  This function makes sure we don't send requests so fast that the
     *  request ids overflow the connection window in the case that one
     *  request died.
     */
    _throttledRequestHandler: function () {
        if (!this._requests) {
            Strophe.debug("_throttledRequestHandler called with " +
                "undefined requests");
        } else {
            Strophe.debug("_throttledRequestHandler called with " +
                this._requests.length + " requests");
        }

        if (!this._requests || this._requests.length === 0) {
            return;
        }

        if (this._requests.length > 0) {
            this._processRequest(0);
        }

        if (this._requests.length > 1 &&
            Math.abs(this._requests[0].rid -
                this._requests[1].rid) < this.window) {
            this._processRequest(1);
        }
    }
};
/*
 This program is distributed under the terms of the MIT license.
 Please see the LICENSE file for details.

 Copyright 2006-2008, OGG, LLC
 */

/*global document, window, setTimeout, clearTimeout, console,
 Base64, MD5,
 Strophe, $build, $msg, $iq, $pres */

/** Class: Strophe.WebSocket
 *  _Private_ helper class that handles WebSocket Connections
 *
 *  The Strophe.WebSocket class is used internally by Strophe.Connection
 *  to encapsulate WebSocket sessions. It is not meant to be used from user's code.
 */

/** File: websocket.js
 *  A JavaScript library to enable XMPP over Websocket in Strophejs.
 *
 *  This file implements XMPP over WebSockets for Strophejs.
 *  If a Connection is established with a Websocket url (ws://...)
 *  Strophe will use WebSockets.
 *  For more information on XMPP-over WebSocket see this RFC draft:
 *  http://tools.ietf.org/html/draft-ietf-xmpp-websocket-00
 *
 *  WebSocket support implemented by Andreas Guth (andreas.guth@rwth-aachen.de)
 */

/** PrivateConstructor: Strophe.Websocket
 *  Create and initialize a Strophe.WebSocket object.
 *  Currently only sets the connection Object.
 *
 *  Parameters:
 *    (Strophe.Connection) connection - The Strophe.Connection that will use WebSockets.
 *
 *  Returns:
 *    A new Strophe.WebSocket object.
 */
Strophe.Websocket = function (connection) {
    this._conn = connection;
    this.strip = "stream:stream";

    var service = connection.service;
    if (service.indexOf("ws:") !== 0 && service.indexOf("wss:") !== 0) {
        // If the service is not an absolute URL, assume it is a path and put the absolute
        // URL together from options, current URL and the path.
        var new_service = "";

        if (connection._options.protocol === "ws" && window.location.protocol !== "https:") {
            new_service += "ws";
        } else {
            new_service += "wss";
        }

        new_service += "://" + window.location.host;

        if (service.indexOf("/") !== 0) {
            new_service += window.location.pathname + service;
        } else {
            new_service += service;
        }

        connection.service = new_service;
    }
};

Strophe.Websocket.prototype = {
    /** PrivateFunction: _buildStream
     *  _Private_ helper function to generate the <stream> start tag for WebSockets
     *
     *  Returns:
     *    A Strophe.Builder with a <stream> element.
     */
    _buildStream: function () {
        return $build("stream:stream", {
            "to": this._conn.domain,
            "xmlns": Strophe.NS.CLIENT,
            "xmlns:stream": Strophe.NS.STREAM,
            "version": '1.0'
        });
    },

    /** PrivateFunction: _check_streamerror
     * _Private_ checks a message for stream:error
     *
     *  Parameters:
     *    (Strophe.Request) bodyWrap - The received stanza.
     *    connectstatus - The ConnectStatus that will be set on error.
     *  Returns:
     *     true if there was a streamerror, false otherwise.
     */
    _check_streamerror: function (bodyWrap, connectstatus) {
        var errors = bodyWrap.getElementsByTagName("stream:error");
        if (errors.length === 0) {
            return false;
        }
        var error = errors[0];

        var condition = "";
        var text = "";

        ns = "urn:ietf:params:xml:ns:xmpp-streams";
        for (i = 0; i < error.childNodes.length; i++) {
            e = error.childNodes[i];
            if (e.getAttribute("xmlns") !== ns) {
                break;
            }
            if (e.nodeName === "text") {
                text = e.textContent;
            } else {
                condition = e.nodeName;
            }
        }

        errorString = "WebSocket stream error: ";

        if (condition) {
            errorString += condition;
        } else {
            errorString += "unknown";
        }

        if (text) {
            errorString += " - " + condition;
        }

        Strophe.error(errorString);

        // close the connection on stream_error
        this._conn._changeConnectStatus(connectstatus, condition);
        this._conn._doDisconnect();
        return true;
    },

    /** PrivateFunction: _reset
     *  Reset the connection.
     *
     *  This function is called by the reset function of the Strophe Connection.
     *  Is not needed by WebSockets.
     */
    _reset: function () {
        return;
    },

    /** PrivateFunction: _connect
     *  _Private_ function called by Strophe.Connection.connect
     *
     *  Creates a WebSocket for a connection and assigns Callbacks to it.
     *  Does nothing if there already is a WebSocket.
     */
    _connect: function () {
        // Ensure that there is no open WebSocket from a previous Connection.
        this._closeSocket();

        // Create the new WobSocket
        this.socket = new WebSocket(this._conn.service, "xmpp");
        this.socket.onopen = this._onOpen.bind(this);
        this.socket.onerror = this._onError.bind(this);
        this.socket.onclose = this._onClose.bind(this);
        this.socket.onmessage = this._connect_cb_wrapper.bind(this);
    },

    /** PrivateFunction: _connect_cb
     *  _Private_ function called by Strophe.Connection._connect_cb
     *
     * checks for stream:error
     *
     *  Parameters:
     *    (Strophe.Request) bodyWrap - The received stanza.
     */
    _connect_cb: function (bodyWrap) {
        var error = this._check_streamerror(bodyWrap, Strophe.Status.CONNFAIL);
        if (error) {
            return Strophe.Status.CONNFAIL;
        }
    },

    /** PrivateFunction: _handleStreamStart
     * _Private_ function that checks the opening stream:stream tag for errors.
     *
     * Disconnects if there is an error and returns false, true otherwise.
     *
     *  Parameters:
     *    (Node) message - Stanza containing the stream:stream.
     */
    _handleStreamStart: function (message) {
        var error = false;
        // Check for errors in the stream:stream tag
        var ns = message.getAttribute("xmlns");
        if (typeof ns !== "string") {
            error = "Missing xmlns in stream:stream";
        } else if (ns !== Strophe.NS.CLIENT) {
            error = "Wrong xmlns in stream:stream: " + ns;
        }

        var ns_stream = message.namespaceURI;
        if (typeof ns_stream !== "string") {
            error = "Missing xmlns:stream in stream:stream";
        } else if (ns_stream !== Strophe.NS.STREAM) {
            error = "Wrong xmlns:stream in stream:stream: " + ns_stream;
        }

        var ver = message.getAttribute("version");
        if (typeof ver !== "string") {
            error = "Missing version in stream:stream";
        } else if (ver !== "1.0") {
            error = "Wrong version in stream:stream: " + ver;
        }

        if (error) {
            this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, error);
            this._conn._doDisconnect();
            return false;
        }

        return true;
    },

    /** PrivateFunction: _connect_cb_wrapper
     * _Private_ function that handles the first connection messages.
     *
     * On receiving an opening stream tag this callback replaces itself with the real
     * message handler. On receiving a stream error the connection is terminated.
     */
    _connect_cb_wrapper: function (message) {
        if (message.data.indexOf("<stream:stream ") === 0 || message.data.indexOf("<?xml") === 0) {
            // Strip the XML Declaration, if there is one
            var data = message.data.replace(/^(<\?.*?\?>\s*)*/, "");
            if (data === '') return;

            //Make the initial stream:stream selfclosing to parse it without a SAX parser.
            data = message.data.replace(/<stream:stream (.*[^\/])>/, "<stream:stream $1/>");

            var streamStart = new DOMParser().parseFromString(data, "text/xml").documentElement;
            this._conn.xmlInput(streamStart);
            this._conn.rawInput(message.data);

            //_handleStreamSteart will check for XML errors and disconnect on error
            if (this._handleStreamStart(streamStart)) {

                //_connect_cb will check for stream:error and disconnect on error
                this._connect_cb(streamStart);

                // ensure received stream:stream is NOT selfclosing and save it for following messages
                this.streamStart = message.data.replace(/^<stream:(.*)\/>$/, "<stream:$1>");
            }
        } else if (message.data === "</stream:stream>") {
            this._conn.rawInput(message.data);
            this._conn.xmlInput(document.createElement("stream:stream"));
            this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, error);
            this._conn._doDisconnect();
            return;
        } else {
            var string = this._streamWrap(message.data);
            var elem = new DOMParser().parseFromString(string, "text/xml").documentElement;
            this.socket.onmessage = this._onMessage.bind(this);
            this._conn._connect_cb(elem, null, message.data);
        }
    },

    /** PrivateFunction: _disconnect
     *  _Private_ function called by Strophe.Connection.disconnect
     *
     *  Disconnects and sends a last stanza if one is given
     *
     *  Parameters:
     *    (Request) pres - This stanza will be sent before disconnecting.
     */
    _disconnect: function (pres) {
        if (this.socket.readyState !== WebSocket.CLOSED) {
            if (pres) {
                this._conn.send(pres);
            }
            var close = '</stream:stream>';
            this._conn.xmlOutput(document.createElement("stream:stream"));
            this._conn.rawOutput(close);
            try {
                this.socket.send(close);
            } catch (e) {
                Strophe.info("Couldn't send closing stream tag.");
            }
        }

        this._conn._doDisconnect();
    },

    /** PrivateFunction: _doDisconnect
     *  _Private_ function to disconnect.
     *
     *  Just closes the Socket for WebSockets
     */
    _doDisconnect: function () {
        Strophe.info("WebSockets _doDisconnect was called");
        this._closeSocket();
    },

    /** PrivateFunction _streamWrap
     *  _Private_ helper function to wrap a stanza in a <stream> tag.
     *  This is used so Strophe can process stanzas from WebSockets like BOSH
     */
    _streamWrap: function (stanza) {
        return this.streamStart + stanza + '</stream:stream>';
    },


    /** PrivateFunction: _closeSocket
     *  _Private_ function to close the WebSocket.
     *
     *  Closes the socket if it is still open and deletes it
     */
    _closeSocket: function () {
        if (this.socket) {
            try {
                this.socket.close();
            } catch (e) {
            }
        }
        this.socket = null;
    },

    /** PrivateFunction: _emptyQueue
     * _Private_ function to check if the message queue is empty.
     *
     *  Returns:
     *    True, because WebSocket messages are send immediately after queueing.
     */
    _emptyQueue: function () {
        return true;
    },

    /** PrivateFunction: _onClose
     * _Private_ function to handle websockets closing.
     *
     * Nothing to do here for WebSockets
     */
    _onClose: function (event) {
        if (this._conn.connected && !this._conn.disconnecting) {
            Strophe.error("Websocket closed unexcectedly");
            this._conn._doDisconnect();
        } else {
            Strophe.info("Websocket closed");
        }
    },

    /** PrivateFunction: _no_auth_received
     *
     * Called on stream start/restart when no stream:features
     * has been received.
     */
    _no_auth_received: function (_callback) {
        Strophe.error("Server did not send any auth methods");
        this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, "Server did not send any auth methods");
        if (_callback) {
            _callback = _callback.bind(this._conn);
            _callback();
        }
        this._conn._doDisconnect();
    },

    /** PrivateFunction: _onDisconnectTimeout
     *  _Private_ timeout handler for handling non-graceful disconnection.
     *
     *  This does nothing for WebSockets
     */
    _onDisconnectTimeout: function () {
    },

    /** PrivateFunction: _onError
     * _Private_ function to handle websockets errors.
     *
     * Parameters:
     * (Object) error - The websocket error.
     */
    _onError: function (error) {
        Strophe.error("Websocket error " + error);
        this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, "The WebSocket connection could not be established was disconnected.");
        this._disconnect();
    },

    /** PrivateFunction: _onIdle
     *  _Private_ function called by Strophe.Connection._onIdle
     *
     *  sends all queued stanzas
     */
    _onIdle: function () {
        var data = this._conn._data;
        if (data.length > 0 && !this._conn.paused) {
            for (i = 0; i < data.length; i++) {
                if (data[i] !== null) {
                    var stanza, rawStanza;
                    if (data[i] === "restart") {
                        stanza = this._buildStream();
                        rawStanza = this._removeClosingTag(stanza);
                        stanza = stanza.tree();
                    } else {
                        stanza = data[i];
                        rawStanza = Strophe.serialize(stanza);
                    }
                    this._conn.xmlOutput(stanza);
                    this._conn.rawOutput(rawStanza);
                    this.socket.send(rawStanza);
                }
            }
            this._conn._data = [];
        }
    },

    /** PrivateFunction: _onMessage
     * _Private_ function to handle websockets messages.
     *
     * This function parses each of the messages as if they are full documents. [TODO : We may actually want to use a SAX Push parser].
     *
     * Since all XMPP traffic starts with "<stream:stream version='1.0' xml:lang='en' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='3697395463' from='SERVER'>"
     * The first stanza will always fail to be parsed...
     * Addtionnaly, the seconds stanza will always be a <stream:features> with the stream NS defined in the previous stanza... so we need to 'force' the inclusion of the NS in this stanza!
     *
     * Parameters:
     * (string) message - The websocket message.
     */
    _onMessage: function (message) {
        var elem;
        // check for closing stream
        if (message.data === "</stream:stream>") {
            var close = "</stream:stream>";
            this._conn.rawInput(close);
            this._conn.xmlInput(document.createElement("stream:stream"));
            if (!this._conn.disconnecting) {
                this._conn._doDisconnect();
            }
            return;
        } else if (message.data.search("<stream:stream ") === 0) {
            //Make the initial stream:stream selfclosing to parse it without a SAX parser.
            data = message.data.replace(/<stream:stream (.*[^\/])>/, "<stream:stream $1/>");
            elem = new DOMParser().parseFromString(data, "text/xml").documentElement;

            if (!this._handleStreamStart(elem)) {
                return;
            }
        } else {
            data = this._streamWrap(message.data);
            elem = new DOMParser().parseFromString(data, "text/xml").documentElement;
        }

        if (this._check_streamerror(elem, Strophe.Status.ERROR)) {
            return;
        }

        //handle unavailable presence stanza before disconnecting
        if (this._conn.disconnecting &&
            elem.firstChild.nodeName === "presence" &&
            elem.firstChild.getAttribute("type") === "unavailable") {
            this._conn.xmlInput(elem);
            this._conn.rawInput(Strophe.serialize(elem));
            // if we are already disconnecting we will ignore the unavailable stanza and
            // wait for the </stream:stream> tag before we close the connection
            return;
        }
        this._conn._dataRecv(elem, message.data);
    },

    /** PrivateFunction: _onOpen
     * _Private_ function to handle websockets connection setup.
     *
     * The opening stream tag is sent here.
     */
    _onOpen: function () {
        Strophe.info("Websocket open");
        var start = this._buildStream();
        this._conn.xmlOutput(start.tree());

        var startString = this._removeClosingTag(start);
        this._conn.rawOutput(startString);
        this.socket.send(startString);
    },

    /** PrivateFunction: _removeClosingTag
     *  _Private_ function to Make the first <stream:stream> non-selfclosing
     *
     *  Parameters:
     *      (Object) elem - The <stream:stream> tag.
     *
     *  Returns:
     *      The stream:stream tag as String
     */
    _removeClosingTag: function (elem) {
        var string = Strophe.serialize(elem);
        string = string.replace(/<(stream:stream .*[^\/])\/>$/, "<$1>");
        return string;
    },

    /** PrivateFunction: _reqToData
     * _Private_ function to get a stanza out of a request.
     *
     * WebSockets don't use requests, so the passed argument is just returned.
     *
     *  Parameters:
     *    (Object) stanza - The stanza.
     *
     *  Returns:
     *    The stanza that was passed.
     */
    _reqToData: function (stanza) {
        return stanza;
    },

    /** PrivateFunction: _send
     *  _Private_ part of the Connection.send function for WebSocket
     *
     * Just flushes the messages that are in the queue
     */
    _send: function () {
        this._conn.flush();
    },

    /** PrivateFunction: _sendRestart
     *
     *  Send an xmpp:restart stanza.
     */
    _sendRestart: function () {
        clearTimeout(this._conn._idleTimeout);
        this._conn._onIdle.bind(this._conn)();
    }
};
